I think Musk being a ketamine addict explains a lot and this is very aligned. Given that he can't build a self-driving car, he would have to be under the influence of very strong drugs to think he could build a Dyson sphere of all things.
That being said, some sort of financial fraud is even more on brand.
The characterisation of “level 5” autonomy as the car handling any conceivable circumstance (not that you explicitly made this claim here) is just silly. Humans can’t handle any conceivable circumstance either.