Okay they say nothing about belt, I give you that. But to clarify, the amount of games you've played ingame doesn't matter much when applying to become a 3d artist.
And for question 2: "While creating your application, make sure to include examples of your work, whether that’s texturing or 3D Modeling. When it comes to examples, remember, it’s more the merrier!"
"Texturing or 3d modeling." If you've got no examples of other things, 3d models are fine too.
Hope it's answered now.