Yes, its fairly normal for distribution platforms to require you to declare that you have the rights for everything in your game (which is in no way provable), extending it to everything in the training set(s) for the model(s) used for generative AI used is ludicrous, but just amounts to the same thing plus the (almost certainly false) assumption that every work produced by AI generation is legally a derivative work of every work in the training set(s) of the AI model(s) used.