No? If you ask it to proofread your stuff, any competent model just fixes your grammar without adding anything on its own. At least that's my experience. Simply don't ask for anything that involves major rewrites, and of course verify the result.

If you can’t communicate effectively in the language how are you evaluating that it doesn’t make you sound like a bot?

Getting your code reviewed doesn't mean you can't code

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Verification is easier than generation, especially for natural language.

The amount of time that I and my colleagues had to fight to not rewrite something instead of fixing it tells otherwise. This is a well documented phenomenon for decades now, so it’s definitely not just my experience. I had the same urge when I started coding, and I had to fight it for a long time in myself.

> any competent model just fixes your grammar without adding anything on its own

Grammatical deviations constitute a large part of an author's voice. Removing those deviations is altering that voice.

That's the point. Their voice is unintelligible in English, and they prefer a voice that English-speakers can understand.