Could this be ai generated?

So, I was checking the ship tag for a pairing I like, and I found a short fic (less than 1000 words) that I really liked. I went to the writers profile to check what else they had written and they had over 500 fics. When I started looking through their works I noticed that they were posting 6-7 works in a day, and they would all be for different pairings but had similar titles, tags, and the story was basically always the same, except it was all changed to fit the specific pairing. None of the works that I saw were tagged with anything relating to ai or chatgpt, and neither the author nor the comments said anything so I didn't say anything. I'm not really sure if I should say something, or if they are even using ai and I don't want to accuse them, but it's really weird and it made me wonder if it could be. What do you think?