The article as a whole is meh, but that quote made skimming it worthwhile.
I've never been impressed by the "rationalist" community around SSC, LessWrong, Overcoming Bias, etc., but I've really struggled to put my finger on it. This gets pretty damn close.
The whole sphere struck me from the beginning (way before present controversies) as a big circle jerk of smart people trying to impress each other. The standard issue rationalist flex is to pick a contrarian point of view and invent an extremely novel argument for it. Bonus points if it skirts close to something controversial or taboo, but doesn't quite cross the line. Then an endless thread of discussion can ensue where all the participants have an opportunity to flex by either agreeing or taking apart the argument.
Problem is: I never got the sense that anything was being accomplished, nor that the ideas coming out of these places stood up when dragged out of their bubbles and examined in the context of the wider world and the wider sphere of human experience.
The first thing that really put me off was the whole idea of runaway super-intelligent AI. Please, please, please for the love of g-d study some biology. Dunning-Krueger is a worn out meme but I think the idea of it applies well to CS people talking about intelligence (as opposed to glorified statistical regression) without knowing anything about biology, which is the only existing example of an intelligent system.
The neo-racist ("human biodiversity") and neoreactionary stuff just put me off further. When it emerged it didn't surprise me one bit that it came from those circles. Contrarian? Check. Controversial? Check. Elitist? Check.
In the end I started thinking of it as an online cult, sort of a really high-brow companion to the 'chans. I guess the hierarchy goes: rationalist sphere > 'chan culture > Qanon.