It's not just LGW where this information matters, by the way. If you were to distribute your game through itch.io, it will ask the same question:

[...] we are strictly enforcing disclosure for all game asset pages due to legal ambiguity around rights associated with Generative AI content.
But since you don't seem willing to answer these questions, I asked an AI image detector. It seems pretty confident that several central assets in the repository are indeed AI-generated. That says nothing about the training data, so I will have to make - what I would call - a reasonable guess, based on your nonanswers.
