I'm Japanese and can't write English, so I think in Japanese and have AI translate it. If that makes my comments read like AI, I guess there's nothing I can do about it.

100% this.

AI is magical for working with multilingual people in multilingual contexts.

I think and write in English, but I have to operate a lot at complex levels in Spanish, so I do the thinking and writing in English and have AI translate it.

As a writer, it pains me to see my own writing, when I read it back in Spanish, sound like AI.

But there's not much I can do about it, considering hiring a personal human translator for every little thing and who can write in a unique way in Spanish to mimic the native equivalent to my style is overwhelmingly unaffordable and too slow for the every day translation type work.

Translation is translation. It retains the structure of your human text.

I guess there's something you can do about it: learn the language (I know it's hard and everything, but "nothing I can do" is something I hear an awful lot with AI these days).

I had a terribly hard time in school with English, I've spent so much time crying and yelling over my tests and homeworks - and now the great equalizer has arrived, anyone can achieve anything, the sky's the limit (or the tokens).