Years before this current trend of LLM generated papers, there was a tool IIRC by some MIT students which would generate plausible looking papers which when actually read were obviously garbage. The title and abstract would have the sort of words you would expect of a research paper, but the resulting sentences would be nonsense.

The idea being that if the submission got published, the review process was obviously a total joke. I think they even had some examples that had actually been published.

Edit, Link: https://pdos.csail.mit.edu/archive/scigen/