This issue with how fuzzy RDR2 look on PS4 Pro has nothing to do with what TV you are using. It is a poorly implemented rendering technique. Period.
I won't deny that this is the best looking game ever made...on a platform that shows it as it is intended, being XBOX ONE X at 4K native resolution.
But, on PS4 Pro, it is one of the shittiest looking games in recent memory as rendering goes.
When you have games like God Of War, Uncharted 4, Horizon Zero Dawn, Shadow Of The Tomb Raider etc., all looking way sharper and clearer than RDR2, you know that something is wrong!
There is even a Sharpening slider in the game settings, but it fails to achieve any meaningful result even on the highest setting.
And as for HDR, it is completely broken. It does exactly the opposite of what HDR is supposed to do. However, this is also not the cause of the problem because even with HDR turned OFF, the game still looks blurry and muddy.