They are more defensive of the racists in the other blog post on this topic: https://forum.effectivealtruism.org/posts/MHenxzydsNgRzSMHY/my-experience-at-the-controversial-manifest-2024
Maybe its because the HBDers managed to control the framing with the other thread? Or because the other thread systematically refuses to name names, but this thread actually did name them and the conversation shifted out of a framing that could be controlled with tone-policing and freeze peach appeals into actual concrete discussion of specific blatantly racists statements (its hard to argue someone isn't racist and transphobic when they have articles with titles like "Why Do I Hate Pronouns More Than Genocide?").
Yeah the original no-politics rule on lesswrong baked in libertarian assumptions into the discourse (because no-politics means the default political assumptions of the major writers and audience are free to take over). From there is was just a matter of time until it ended up somewhere right wing.
I hadn't linked the tendency to go meta to the cultishness or no-politics rule before, but I can see the connection now that you point it out. As you say, it prevents simply naming names and direct quotes, which seems to be a pretty good tactic for countering racists.
I'm not sure that rule-set made HBD hegemony inevitable, there were a lot of other factors that helped along the way! The IQ-fetishism made it ripe for HBDers. The edgy speculative futurism is also fertile ground for HBD infestation. And the initial audience and writings having a libertarian bend made the no-politics rule favor right wing ideology, an initial audience and writing set with a strong left wing bend might go in a different direction (not that a tankie internal movement would be good, but at least I don't know tankies to be HBD proponents).
Yeah, it seems really rare for a commenter to simply say racism is bad, you shouldn't invite racists to your events. Even the ones that seem to disagree with racism impulsively engage in hand wringing and apologize for being offended and carefully moderate their condemnation of racism and racists.