Broken record: LLMs are exceptionally useful writing critics if you know how to hold them correctly, but you can't use a single word they suggest to you --- the better the LLM's word choices seem, the more likely the LLM is infecting your voice. Better, by a lot, to prompt the LLM not to suggest any words, but just offer objective critiques.
Potentially dumb question, but could you expand on how you use LLMs as writing critics? Do you just ask them to flag bad writing? I'm asking because I don't think i'm skilled in writing.
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Now there's an idea. LLMs may have taken the em-dash from us, but the em-en dash is unknown to Strunk & White and might be human-exclusive for some time yet.
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.