Agreed, even a perfectly trained clone of chatGPT wouldn’t get that high a hit rate, although I do think that the larger the article being compared, the better its chances would be of making an accurate prediction. The thing is that we soon won’t actually be able to tell the difference as computers get smarter. Sees like right now the only practical application is for kids to cheat on their homework, but what happens when it gets smart enough to write actual research papers with unique proofs?