What display do you have?
On my oled, it does look good and like it is working initially but go to any dark/black area and you'll quickly see that something isn't quite right, I've tried messing with all my settings and it still doesn't fix/improve the dark areas part.
Also, this subreddit thread basically confirms it for PC too:
https://www.reddit.com/r/cyberpunkgame/comments/kayprp/pc_hdr_isnt_broken_possible_fix/
I have the full array Q8 Samsung from 2018.
Windows is on, RGB 8.
Cyber punk set 1.4, 1500,100
TV is in game mode with game motion plus and freesync/gsync on.
Hdmi black level normal, backlight 45, contrast 45, colour 40, brightness 0, local dimming and contrast enhancement high, gamma st2084 at 0 and colour space native on latest firmware.
For me the dark areas are where the HDR on this game really look great better than any other game I have tried. The blacks are inky black (nothing like Vincent's video) and the highlights and colours are just so clean and vibrant.
Basically what I'm seeing is nothing like his video at all, this game made my TV come to life.
My friend has similar TV to mine and he also said it was the best HDR he had seen in a game. He is on stock firmware so using completely different settings.
Both of us big into HDR, he has pretty much every HDR 4k blue ray disk ever released and I have pretty much every HDR pc game ever released, I only play HDR games.
Something is clearly a miss here because mine is nothing like Vincent's, when I go from SDR to HDR everything gets better not worse.
(I'm playing with ultra ray tracing)