I'm watching it now. Since I've drawn the line at Jumunji, it's hard to tell which side of that line to put this. I can definitely see arguments for and against. My take is that it is indeed an alternate world that inspired the game (the clue is the library which holds books yet to be written contains ancient famous works we know to be written long ago, so it's set in our past), therefore the only tabletop fiction scene is the one pictured above, and the teleportation scene, which both total less than four minutes. So even though those moments were very good, they do not imply that the rest of the film takes place within the game (even though our hero incorrectly guesses that it might be), nor do those moments take up much time from the film. It's splitting hairs, and this is just on the line, but as far as my website is concerned, this is not a work of tabletop fiction. However I fully support and encourage people to curate their own lists of tabletop fiction and include this work on them. Though if you include this, you should definitely include Jumunji, and if you want to slide the slippery slope further, you may wish to include E.T. as the characters are seen to play Dungeons and Dragons in that film.