I don't know what these 'students' are doing, but it's not very hard to prompt a system into not using the easily detectable 'ai generated' language at all. Also adding in some spelling errors and uncapping some words (like ai above here) makes it more realistic. But just adding an example of how you write and telling it to keep your vocabulary and writing some python to post process it makes it impossible to detect ai for humans or ai detectors. You can also ask multiple ais to rewrite it. Getting an nsfw one to add in some 'aggressive' contrary position also helps as gpt/claude would not do that unless jailbroken (which is whack-a-mole).
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