I suspect this essay is obliquely complaining about folks who THINK they're the smartest guys in the room.
"What you get if you believe this myth is a room full of highly qualified people who waste their time explaining to each other how much more qualified they are."
Excellent observation. There is also a bit of that in there. A part of working on a small team is learning to learn. It doesn't matter that you can lift mountains with your pinky if you can't deal with anyone else as a peer.
"What you get if you believe this myth is a room full of highly qualified people who waste their time explaining to each other how much more qualified they are."