Extremist? Certainly not.
President Trump doesn't share it because he doesn't want to admit he was fooled by "professionals" who lied to him, likely playing to his admitted germophobia. It's hard to be the winner when con artists, and not even good ones, take you for a ride.
Actually it’s because Trump isn’t a fool. He’s always had a Best Practices policy, and he has listened to people who actually know what they are talking about.
He questions them to learn why they think what they do and learns for himself. The alternative of taking advice from charlatans and crackpots doesn’t have an appeal for him.