Ad-hominem (literally: "to the person") requires a person on the other side of the argument. This wasn't made or written by a person, thus ad-hominem does not apply.
Thats a bit pedantic. Youre still arguing against an entity rather than addressing the argument.
If you prompted an LLM to make a PSA that people should brush their teeth, is it a fair to argue that brushing your teeth is bad because an LLM made the argument?