That guy is awful... just console war clickbait.
VRR is not an advanced feature you have to code for - believe it works with any pc game that's not got v-sync toggled on with a compatible graphics card and monitor, surprised its not working out of the box on the PS5 but Sony's other stuff is on point so maybe wasn't a priority.
VRS - I've only heard about this being used in Gears, a first party title that has been polished. I would be interested to hear if its been used on anything else yet?
I'm disappointed with how Valhalla performs on all platforms(Takes a silly set up to hit 60fps at decent res on pc). It doesn't seem a massive leap over previous open world titles? but runs like shit.
N.b only watched it being played on YouTube, not played myself so might be much more impressive for reals.