You are probably right. (And my recollection is that @KevPham is correct, I think there is technically already an unofficial or official rule against AI generated content in posts/comments. At least I recall @jonah saying something along those lines). (edit: this is the exchange I was remembering)
The reality is that if I can’t tell you’re using ‘AI’ to fix your grammar then it will never become an issue.
Just to be clear, I don’t personally do this (not for tone, not for grammar, not for anything)
My comments are my own (as evidenced by my often embarrassing grammar, meandering comments, and the occasional made up word, + the 13 edits it sometimes takes me to try to clarify what I meant to say) 
Like you, I find the generic wishy-washy AI tone, overuse of emojis, relentless bland cheerfulness to be annoying, distracting and not helpful.
I do think AI formatted content should be included in that
While I’m often annoyed by AI generated text, I think decent AI generated text can in some cases clarify bad human formed text.
We’ve all encountered people online who don’t use paragraphs, don’t use punctuation, are really passionate about a subject but struggle to communicate effectively or calmly, or write in an almost stream-of-consciousness style. That is the sort of edge case I was thinking of. But you are probably right that making explicit exceptions for random edge cases is an unnecessary over-complication.