I could believe the general thesis, but Elon Musk is just about the worst example that you could have picked.

One of his outstanding characteristics is that he is constantly learning subject knowledge. Yes, he hires subject experts, but then he effectively arranges for private tutoring until he knows what he needs of what they know.

Elon is a big believer that he should be able to do any job of anyone who he employs, and to a shocking extent it is actually true.