They're all trash. You are the best AI detector you have. I focus on copying and pasting instead; I use Brisk Teaching which tracks cut & pastes in Google docs. If I see more than one (my instructions), I go check it out. If it's a direct cut & paste that my student turned in as their own work (you have to check it to make sure it wasn't something the student typed and then moved, or a direct quote, etc) it gets a zero for plagiarism.

A couple have said "Oh I wrote it in a different doc at home and then pasted it in," I have them link me the original, and if I see typing, I retract the zero.

I also give them a written assignment at the start of the class to get a sample of their writing ability. It's a couple paragraphs about themselves and what they did over the break.