If you've had to delete 10 posts by the same user, which you suspect is an AI agent, it's safe to say that deleting all posts ever made by that user is a good shortcut.
There are a lot of people in this world who just don't think that way. I know someone involved with a research project, they had a spreadsheet(not excel but similar) with something like 250 columns and tens of thousands of rows, and they tasked an assistant with replacing all the empty cells with 0 for some reason.
This was supposed to take 2 weeks of manual work, I took a look at it, googled how to do it automatically, finished the whole thing in a few minutes.
But both this assistant and the PhD they reported to were ready to spend 2 weeks doing it manually.
