You’d already know that if you hear him talk about something you have knowledge about. He is spewing bullshit so confidently, only a layman would think it sounds logical.
But to hammer it home.
Elon has a degree in Economics. He tried to go for Physics as well but he wasn’t smart enough.
Only 2 year after he left school did he get a degree, when the school received a big donation. He just bought his degree.
Didn’t stop him from claiming he got the degree during those 2 years either. He even got sued for that.