Guessing this doesn't have the 4K textures considering for PC the main game is 100GB and the main game with optional 4K textures is 150GB according to one of the producers.
EDIT
Apparently it does have the high res assets, At 4K max settings it's using 11.7GB of GPU memory, With the high res assets option turned off it uses 10.2GB and gives about a 10FPS boost.