Is that an actual drop-off in commenters, or in comments? The latter is readily explainable by “commenters who would previously call out the errors now choose to not engage with those comments/posts at all”.

In any case, I don't think it's a bad thing to want to communicate as clearly as possible, and if an LLM helps you do that, I ain't one to judge. Sure, ideally I'd want to read folks' thoughts without the LLM-induced layer of vaseline smoothing them over, but even that's better than not reading them at all :)