Numerous high-resolution texture packs have been around for years.

Minecraft by default ships with a 16x16 or 32x32 pixel tile size texture pack but community-made packs have much higher resolutions if you want them (128x128 tiles, 256x256, etc).

True. I guess I was trying to point out that it is fancy they used a NN to generate new textures, but without releasing it out as a texture pack, they lose a cool opportunity to let people experience the results themselves. I suspect that the screenshot at the bottom simply used one of the existing high resolution texture / shader packs.