[gwd]

> He’s in an accidental echo chamber.

Given what the author in TFA says, I'm not sure "accidental" is the right word:

> He has demonstrated time and again that when he does not get his way or has no leg to stand on he will default to subterfuge to achieve his goals.

Being surrounded by "yes men" is the inevitable consequence of that kind of behavior. He may not have thought, "You know what I need, I need to be surrounded by people who will never tell me I'm wrong"; but if he isn't doing the hard work of choosing to listen people who do tell him he's wrong, he is implicitly choosing to surround himself by yes-men.