Unlike the more common pattern, Elon doesn't hesitate to make straight up engineering decisions for his businesses, including ones that look unnecessarily high risk to a lot of his own engineers. Chopsticks catching spaceships made of stainless steel and self driving cars without lidar are well known examples. The success of those choices earns him legit nerd cred.
As far as physics is concerned (his initial background), he definitively is knowledgeable for a CEO yes.
Self-driving cars without LIDAR was a pure cynical business decision and hasn't worked well technically.