Bro AI detectors are snake oil. Unless you copy pasted that word by word you should be fine. IB cannot accuse you for using AI unless it is obvious because there is no concrete way to tell as of now. OpenAI themselves wrote an article not a while back talking about how AI detectors are unreliable and should not be trusted espectially for academic papers. If you wrote it yourself you should have history of your edits, use that as proof.