I'm pretty sure my mistake was assuming people had read the article and knew the author veered wildly halfway through towards also advocating against using LLMs for proofreading and that you should "just let your mistakes stand." Obviously no one reads the article, just the headline, so they assumed I was disagreeing with that (which I was not.) Other comments that expressed the same sentiment as mine but also quoted that part did manage to get upvoted.
This is an emotionally charged subject for many, so they're operating in Hurrah/Boo mode[1]. After all, how can we defend the value of careful human thought if we don't rush blindly to the defense of every low-effort blog post with a headline that signals agreement with our side?