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Using AI to correct your grammar is not any kind of cheating to the forum. The one I see as cheating is having AI to make posts and reply for you in the forum while putting on a paid signature.
For people who are not fluent in English, they should find a good tool to translate their thoughts so that others can understand them easily. Transatle users have been considered less than perfect in grammar, then AI appeared and some people used it to improve grammar. I don't call it cheating, unless they use AI to reply to posts instantly.
Over time, many translation tools will likely integrate with AI, resulting in better translations. I'm not sure to what extent it would be considered an AI post if people were just using it as a translator. But so far, I'm pretty sure using AI as a translation replacement is possible, although I haven't used it yet.