(CNN) — Tesla's stock is finishing out its tumultuous year with yet more turbulence: It's up almost 6% Thursday, but still down more than 10% since last week. And a new cut to its price target from Morgan Stanley isn't helping.

Year-to-date, the stock is down about 70%. Morgan Stanley analysts on Thursday said that the company's sliding stock price represents a buying opportunity, but they cut its price target from $330 per share to $250. Tesla shares are trading at $122, with the stock up about 8% Thursday.

Morgan Stanley still believes the company is somewhat undervalued as a result of the big recent sell-offs, citing its head start over the electric car competition, and potential tax advantages as a result of the Inflation Reduction Act passed earlier this year.

The losses, however, have further put a dent in the fortunes of one of the world's richest people. According to the Bloomberg Billionaires Index, CEO Elon Musk is now worth $132 billion — less than half what he was worth at the beginning of the year. He lost the world's richest person title two weeks ago to Bernard Arnault, the chairman of French luxury goods giant LVMH.

Why Tesla is tanking

A popular misconception has emerged about Elon Musk and Tesla: The megabillionaire's love affair with Twitter is the main reason Tesla shares have lost so much value this year.

Even as Musk signals he may give up his CEO title at Twitter, investors became concerned that the outlook for Tesla's sales and profit is taking a turn for the worse. A sign of the weakening demand: Tesla has announced a rare sale. The company offered two rebates for buyers who take delivery of a vehicle before the end of the year, initially offering a $3,750 discount earlier this month. Tesla then doubled that rebate to $7,500 last Thursday.

"Tesla clearly is starting to see demand cracks in China and in the US at a time that EV competition is increasing across the board," said Dan Ives, tech analyst with Wedbush Securities and a Tesla bull who cut his price target for the stock last Friday from $250 to $175. "The price cuts that Tesla enacted was the straw that broke the camel's back on the stock."

Another reason Tesla's stock is sinking: The US economy could tip into recession next year, hurting car sales. Musk said on a Twitter Spaces call two weeks ago that he foresees the economy will be in a "serious recession" in 2023.

"I think there is going to be some macro drama that's higher than people currently think," he said, according to Reuters, adding that homes and cars will get "disproportionately impacted" by economic conditions.

Tesla's questionable valuation

Part of the problem with Tesla's stock price is that critics question whether it was ever worth the trillion-dollar valuation it had at the start of the year. At its peak, Tesla was worth more than the 12 largest automakers on the planet combined, despite having a fraction of the sales of any of them. Today it is worth $399 billion.

"It got ahead of itself in the near-term," said Gene Munster of Loup Ventures, another Tesla fan. "I still believe this can be a much bigger company. I think it will see those kinds of numbers again. But it could take a long, long time to get there."

Tesla's growth prospects - a target of 50% sales growth annually, helped drive that valuation. It conceded in October that it will miss that sales target for this year.

The stock's climb to dizzying heights -- rising 743% in 2020 alone -- was driven by Musk's reputation as a genius who would disrupt the massive global auto industry.

"Tesla was viewed as a disruptive technology company, not as an automaker, and a large part of that premium is related to Musk," said Ives.

Overpromising and underdelivering

Critics of Tesla said much of its sky-high valuation was based on promises that Musk made about future products, many of which came years after they were originally promised.

A prime example is the Cybertruck, the Tesla pickup truck, first unveiled three years ago with promises that production would start in 2021.

Now production is slated to start next year, with a ramp-up in production in 2024, putting it years behind other electric pickup offerings from Ford and upstart EV maker Rivian, both of which have electric pickups available for purchase today. It could also trail planned electric pickup offerings from General Motors.

"Elon Musk has a pathological problem with the truth," said Gordon Johnson, one of the largest critics of Tesla among analysts. "When people say he's a genius and innovator, it's based on all his promises he never lives up to."

Johnson said Tesla shares will have a much steeper fall ahead, once it starts being priced like other automakers rather than on its promises. He said that for Tesla to hit its growth targets it needs to be building new plants almost every year, but that new factories in Germany and Texas that opened in spring are still not operating at full capacity. And he said that its plant in China has had to scale back production due to weak sales in the market in the face of the Covid restrictions.

"Demand in the US has collapsed," he said. "Two months ago, your wait time was two or three months. Now you can get one immediately. They're going to build more cars than they sell for a third straight quarter. It's the definition of excess capacity."

Tesla is still by far the largest EV maker worldwide, although that title is being challenged in some key markets, by Volkswagen in Europe and by BYD in China. And more competition is coming from established automakers such as Ford and GM.

The Twitter factor

That's not to say Twitter has played no role in Tesla's stock price demise this year: Tesla shares have lost over 65% of their value since Musk's interest in Twitter was first disclosed in April, with a nearly 50% decline since he closed on the deal in late October.

Investors have been disappointed that Musk appears to be paying for so much of his $44 billion purchase of Twitter by selling Tesla stock. Musk, Tesla's largest shareholder, has sold $23 billion worth of Tesla shares since his interest in Twitter became public in April.

On a Twitter Spaces call last week call, Musk promised he was done selling shares of Tesla stock until at least 2024, if not beyond. But he hasn't lived up to a previous promise in April that he was done selling Tesla shares, selling $14.4 billion of that stock since that time.

"It's been a Pinocchio situation for Musk saying he is done selling stock. Investors want to see him walk the walk and not just talk the talk," said Ives.

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