Moreover, the parent comment linked to a decent PR presumably human made. If an LLM had written the PR, its description would be 9 paragraphs long and the code changes full of assinine comments.

If the author really did one-shot the PR, then the author must have also put in the extremely detailed and tedious work which would be required to tame LLM output for this specific repo, in which case, they actually put in real effort, applyed expertise and thoughtfulness, which is the whole issue at hand.