It may be out of their expertise as chemists, but it may be well within their domain as educators. If their students are turning in GPT-written papers, then it's their problem.

I don't know what kinds of papers their students write. I don't recall writing a lot of papers in chemistry class, but they may be teaching a different kind of class. I could imagine them asking for papers on "careers in chemistry" or "history of some famous chemist" that students could cheat with GPT.

Even if that's the case, their paper should probably be more specific to the chemistry domain. Though perhaps they're called on to teach General Science classes as well, which could be even more likely to generate essay assignments prone to cheating.