Aren't the gausian splats the output here? Or are these worlds fully meshed and textured assets?

From my understanding, admittedly quite a shallow look so far, the model generates gaussian splats then from that could implement the collider.

I guess from the splat and the colliders you could generate actual assets that could be interactable/animated/have physics etc. Unsure, exciting space though! I just don't know how I would properly use this in a game, the examples are all quite on-rails and seem to avoid interacting too much with stuff in the environment.

The page shows, near the bottom, how the main output is gaussian splats, but it can also generate triangular meshes (visual mesh + collider).

However, to my eye, the triangular meshes shown look pretty low quality compared to the splat: compare the triangulated books on the shelves, and the wooden chair by the door, as well as weird hole-like defects in the blanket by the fireplace.

It's also not clear if it's generating one mesh for the entire world, it looks like it is - that would make interactability and optimisation more difficult (no frustrum culling etc, though you could feasibly chop the mesh up into smaller pieces I suppose).