I didn't notice a big difference after the patch myself, but my headset was already totally fine imo. Maybe they did something with the FV I dunno, but I think it's possible some people are noticing it more because maybe all the headsets/PS5s aren't upgrading from the same version? Only reason I can think that so many people swear it's better and others don't.
Edit: And I just made it into the Castle in RE8 well, upto meeting Duke in the Castle after a few sequences - they really went all out for that castle, it's amazingly detailed. I'm going to really enjoy exploring around in there! I need to read a little lore on the Duke and how/why he is kept alive when like no one else is. Just seems funny he'd buy all the crap you steal from the castle if he's in their inner circle, but he strikes me as almost above everyone else in the hierarchy haha, like they wouldn't dare insult him.