“You have to be very careful,” Simone Fischer-Hübner, a computer science researcher at Karlstad University, told Aftonbladet, warning against using ChatGPT to work with sensitive information.

I mean, sending queries to a search engine or an LLM are about the same in terms of exposing one's queries.

If the guy were complaining about information from an LLM not being cited or something, then I think I could see where he was coming from more.