I see many Youtubers who are certainly still writing their own scripts, but every once in a while you can tell they absolutely used a Claude correction in one place.

IMO, it's still better to not let an AI critique your writing style at all, only the facts and claims you're making against its context / MCPs. Your own writing style is a reflection of your mind's thought process and, especially on forums like this one, is the only way to imbue your ideas with your personality.