Likely they use LLMs so much they have made it part of their identity.

It's like a gun enthusiast throwing a fit because you don't want them to bring their gun into your house. "I get that you find it useful to have a gun at your house, and I understand that we are never going to revert back to the days when guns didn't exist, but we don't allow them in this house."

(and not, I'm not slyly trying to say LLMs are like guns, yeesh)