It’s a blind guess that’s weighted against people who are well read and don’t type like complete idiots. AI are trained on human language. They write like human writers. There’s no universal magic formula for “how AI would generate text.” AI detectors are nonsense. That is all they are. The only thing you’re doing by using them is feeding data in and accusing people of being witches if an AI tells you they are.

Aha! Now I’ve got you!