It’s called an “Enhanced Graphics Pack”, which makes it slightly unclear. I’d want “enhanced graphics” and would think I’d be getting “enhanced graphics” if I downloaded it 
But I have a 1080p monitor. So, if 4K is a requirement, that should be explicitly stated.
Dear Microsoft, may we get clarification/confirmation that this pack is, truly, only meant for 4K monitors and not for 1080p monitors, too? If 4K is a requirement and/or the enhanced graphics would look bad on 1080p, then a “4K monitor” should be mentioned as a requirement on the Steam and Microsoft Store pages, imo. Maybe rename the pack to “Enhanced (UHD 4K) Graphics Pack,” too. This will help non-4K users know it shouldn’t be downloaded/used when they see it on the game’s DLC tab in Steam.
I admit, it’s been a little unclear for me.