Well, considering many people around here do not have English as their native language and they may try to use AI in a reckless way to inflate their participation, there is a good chance some of them could get caught eventually, while developers all around internet work on better solutions for detection.
Would you care to link me to the profile of the user you are talking about, I am curious and I would like to give a look to their posts. Thank you in advance.
One example in this thread by LoyceV - I've linked the post to his name and not his profile
The link where he found some cheaters - https://bitcointalksearch.org/topic/bounty-spammer-meets-ai-chat-generator-can-they-be-banned-on-the-spot-5434499
Another example by elevates in this thread - https://bitcointalksearch.org/topic/m.61751636
And now, the profile link of the user who tried AI plagiarism in a signature campaign -
https://bitcointalksearch.org/user/mendace-1983110
And finally the link that describes him as an AI spammer -
https://bitcointalksearch.org/topic/m.61761161