I'm a fan of Tesla, but not Musk. You really can't believe much that comes out of his mouth. If you look at his past claims it becomes clear that he should just be ignored.
Tesla has great products, created and supported by thousands of people who appear to go above and beyond. Kudos to them. And kudos to Musk for the vision and the early execution, but that doesn't mean I have to like him or believe that he is the right person for this phase of the companies growth.
This is essentially unfalsifiable. In the case claims about FSD or a person on Mars are wrong then this statement can only be proven wrong when Elon Musk chooses to admit defeat - suffering a significant personal financial loss as a result - or when he retires.
The main example, of course, is in self-driving where he has most certainly not delivered. And he wasn't just a little off.
But also his claims about being able to automate the manufacture of Model 3 turned out to be very wrong and to do terrific damage to the company - they are/were way ahead with their technology and should have taken a less risky approach to getting that tech onto the market and taking advantage of that lead. And how did he not learn from the model X experience?