I think his real assertion is that PG is a bullshit artist, which seems essentially accurate to me. The world is full of people who, having achieved success (and more critically fame and money) become intellectually lazy and convinced that their own intuition (or other relevant natural ability) is infallible.

I feel like I'm in the same boat as the author. PG used to be one of my favorite writers on the web, and now he just seems full of it.