Ah, I would consider that fluff, which is okay in my book. I don't use it for writing, personally, but what I tell my students is that if it'd be fine for a friend to do the thing and not get coauthorship, it's fine to use AI for that (provided you acknowledge it, as you would a friend who provides some helpful comments on a draft). Proofing and suggesting minor stylistic things fall under that umbrella IMO.