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.
What's an example of this? His timelines are often much too aggressive for reality but he repeatedly delivers (eventually).
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?
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.