If GS changed mind, most likely it's because of FSD and Tesla network. They don't understand the tech, but they do understand this is not a "head you win a dollar, tail you lose a dollar" scenario. It's a case that head (FSD) you win 10 fold, tail you lose nothing (leading position in EV and energy still has significant value, both are becoming trillion dollar markets).
Early this year shorts managed to drive down the stock, looking back we can see the move was based on lies. Nothing that shorts said turned out to be true. They even shorted the bond to make it look like the company will fail, now the bond is back up too.
In the past, many shorts had a valuation model that Tesla has a hard market cap limit of 80B, they think there is no way such a niche EV maker could become larger than GM+Ford. Because of that faulty model, they were very brave to keep shorting more as the stock goes up. Once they understand this company has a clear path to reach $800B, they will not be so brave to keep adding short position.
I think Tesla's valuation model will be readjusted within the next 12~18 months, so many catalysts are lined up.
Future demand expectation will go up; a lot more people will understand EVs are more compelling than ICE vehicles.
Energy portion will be valued to a positive number instead of zero;
Producing in China and EU can help a lot to reduce cost. Tesla's margin will likely to go up - big surprise for shorts;
FSD is the biggest wild card. I expect this alone to add $100B market cap within 18 months.