There is quite a difference between fixing grammar and the fuller rewording that is often used especially by LLM based writing tools. The distinction is much more of a grey area when you not talking about a language you are fluent in, because you don't know the difference between idiomatic equivalences and full-on rewording that will change your perceived tone⁰ - the tool being used could be doing more than you think and not in a good way.

And if you are using the tool, “AI” or not to translate it is even worse and you often only have to do on cycle of [your primary language] -> [something else] -> [your primary language] to see what a mess that can make.

I'm attempting to learn Spanish¹ and when I'm writing something, or practising something that I might say, I'll write it entirely away from tech (I have even a proper chunky paper dictionary and grammar guide to help with that!) other than the text editor I'm typing in, and then I'll sometimes give a tool it to look over. If that tool suggests what looks like more than just “that's the wrong tense, you should have an accent there, etc.” I'll research the change rather than accepting it as-is.

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[0] or even, potentially, perceived meaning

[1] I like the place and want to spend more time down there when I can, I even like the idea of living there fairly permanently when I no longer have certain responsibilities tying me to the UK², and I'd hate to be ThatGuy™ who rocks up and expects everyone else to speak his language.

[2] and the shithole it has the potential to become over the next decade - to the Reform supporters and their ilk who say, without any hint of irony, “if you don't like it why don't you go somewhere else” I reply “I'm working on that”.