Have you ever heard about Bobby Fischer's opinions on literally anything other than chess? Is he not intelligent?

As the other poster said it's not relevant how smart someone is in one arena because they can have dogshit opinions in others.

https://www.chess.com/blog/Rodgy/the-genius-craze-of-bobby-f...

Well if we want to language lawyer things it actually says delusional moron which could imply an intelligent person under delusions acts moronically. But in reality we're discussing this using colloquial terms so I don't think your complaint carries much water.