As of November 2023, AI detectors (there is one built into Turn It In) can be fooled and are also biased - accusing non-English students of using AI when they have not.
See the following articles:
We tested a new ChatGPT-detector for teachers. It flagged an innocent student.
ChatGPT Detectors Are Biased and Easy to Fool, Research Shows
I recommend reading articles in The Chronicle of Higher Education about AI and how colleges/universities are incorporating it.