If LLMs can identify a person across websites, I can ask LLM to read up his posts and write like him impersonating him and then this feeds back into the tools identifying him. I can probabilistically malign a person this way.
LLM's are probably better at it, but I don't know if this is as destructive as people may guess it would be. Probably highly person dependent.
The micro-signals this paper discusses are more difficult to fake.