Hi Joe, welcome to the jam and thanks for making a post! I don't know if there's a lot of discourse around it. People have suggested a lot of random examples in one thread, one that stood out to me was Mazes and Monsters, a book/movie from the satanic panic in the 80's that was a form of negative propaganda about D&D. It featured a fictional stand in game for D&D called Mazes and Monsters. Also I made a thread about the works of Jorge Luis Borges, who wrote book reviews of fictional books.
My plan for my entry is to make up some kind of new form of game and write a supplement for it. I am leaning maybe a Choose Your Own Adventure style game written by an actual play group with a revolving GM, it's not really fleshed out yet.