Is any expression of appreciating reason egotistical to you?
I'm going to respond to just this bit of your comment, if you don't mind, because I think this is the core of both your and the author's misconception, with everything else flowing from that.
The author didn't, and still doesn't 'appreciate reason'.
They joined a cult of superiority and in-fighting that labelled itself as appreciating reason. Now they're out of the cult, but they think the issue is not with themselves, but with the others who did appreciating reason wrong. The fundamental flaw that they still haven't examined is that they still view themselves as a truth-seeker who was misled, not someone who made the wrong choices.
I've been wrong a lot, about many things, and there's always the easy temptation of reacting to that by treating it as just bad luck, believing that I did everything right but circumstances conspired against me. It's an easy option, but it's false, and it means you get stuck in the same pattern again.
Humility comes from recognising the ultimate, rather than proximal issue. Not 'I am still smart but the others were wrong and I got muddled' but 'maybe I am not as smart as I thought I was'. The article focuses on the movement as having the same flaws as everything else--it wasn't the superior home they were seeking--but doesn't consider the two most important elements required for growth here:
- Their own flaws and culpability
- The flaws inherent to the movement that aren't shared by society
The take away is 'the rationalist movement is no better than other groups, but I am' rather than 'both I and the rationalist movement have significant flaws that are not shared by everyone'.