Just to be clear, these are hidden prompts put in papers by authors meant to be triggered only if a reviewer (unethically) uses AI to generate their review. I guess this is wrong, but I find it hard not to have some sympathy for the authors. Mostly, it seems like an indictment of the whole peer-review system.
Back in high school a few kids would be tempted to insert a sentence such as "I bet you don't actually read all these papers" into an essay to see if the teacher caught it. I never tried it but the rumors were that some kids had got away with it. I just used it to worry less that my work was rushed and not very good, I told myself "the teacher will probably just be skimming this anyway; they don't have time to read all these papers in detail."