And if they in their review work have agreed to a "no LLM use" policy, but got exposed using LLMs anyway, then their submitted research article is desk rejected. Theoretically, someone could have submitted a stellar research article, but because they didn't follow agreed policy when reviewing other people's work, then also their research contribution is not welcome.
(At first I understood that innocent author's articles would have been rejected just because they happened to go to a bad reviewer. But this is not the case.)