It also slightly improves a few other things with the HDR. It adds a new HDR mode to retain the original hazy look more, keeping it closer to the original artistic vision. It restores film grain with DLSS and makes it more pronounced.

It improves the UI look in HDR and implements the HDR mode that retains the original game look. It fixes the buggy/noisy ray tracing reflections that are also present in the vanilla game.

It's an incremental patch you can put on any version of the game.