I think that's an entirely different situation. I dont own the game, but if it was "remastered" than it makes sense if it looks better on a higher resolution, as that word usually implies an upgrade over the original. Compared to what
@KingFrog is saying, where if you just bump resolution of a game with already bad textures, they will stand out more. Resolution is not something that really changes anything in that regard.
For example, there's little difference between Forza at 1080p and Forza at 4k. The changes you do notice have more to do with the resources now available from the changes they made to the game like vehicle modeling, and the introduction of HDR. If it's just a resolution change, it's not going to be making the game look better, concerning the textures.