It could have still been a patch, if they ported the game over to PC, they wouldn't have to redo the whole game.No can't, because you don't understand the consoles never had any real 4k assets even they output at 4k
They had to redo the textures and all that, that's why its called A REMASTER, not a native 4k patch, the game is extremely upgraded from the ps4 version which has bland textures everywhere, I know because I played it on my oled where its more noticeable because the image quality is so clear