No, the problem is that by all sane metrics, Tesla is currently overvalued by a factor of 20. The markets could shift the decimal point left one place, and it would still be wildly overpriced. That cash pile you're talking about is significantly smaller than the amount of money that Musk has made from owning Tesla shares.
Now, can Tesla sell 20 million cars? Yes, eventually, sure why not, is there a time limit?
Can they get 1 million Robo taxis on the road? They're currently about six years behind Waymo, so probably not.
10 million FSD subscriptions? Only if given away with something else. Like, if it comes free with Grok Pro that might be cheap enough.
Can they sell 1 million humanoid robots? This isn't inconceivable, but the market has yet to be validated. We have yet to see how good the software really is in the real world, or what the real world really needs. I wouldn't bet on it either direction.
But the share price target? That only makes sense if the USA experiences genuine hyperinflation. Which isn't impossible, and sadly is starting to be no longer inconceivable either.