I think you're misunderstanding the purpose of DFs videos. They never spend much time looking at mean fps because it would make for pretty short clips, instead they analysis performance overall and focus in on any stress points. Stress points can be a very small % of gameplay so they won't make a huge impact on a mean fps, but that doesn't mean they're not noticable in a play through. i.e everytime a boss performs a certain attack. This has been typically of every video they make, if there are stress points they focus on it, even if its just a cutscene.
Both games have a very stable FPS, they mention this, you also see it in the frame graph. But at 60fps the PS5 version shows occassional high percentage drops (going from 60fps to 50 or less), they stated this doesn't occur during gunplay when facing actual enemies. They don't mention mean fps because they're more interested in places where people will actually see drops and places where the system exhibit differences. None the less they do state and show that both systems are the majority of the time 60fps.
Anyone who watches DF's content should able to be aware of the fact that its just a tech breakdown. They look for technical aspects to speak about, I find it super interesting but at the same time when they zoom in to grass blades to show the difference in resolution between 2 versions of a game or show a few frames dropping in the heaviest action, I know full well that won't impact my experience at all. If anyone comes away from a video like this thinking the PS5 version is bad or feeling defensive of it, they're watching more with their feelings than with their brain. And this goes for a lot of their content. People need to stop getting touchy about things they literally wouldn't be aware off if it wasn't for these tech breakdowns.
DF actually said this could be a bug, as well.
potentially a bug and you can fix this, as it appears randomly (ei. not always).
John even mentions that just restarting from a checkpoint, and redoing it, and its gone.
Some have said, even when they go past the same part, it isnt there (always).
So if its a performance issue that pops up randomly... possibly theres a fix to it.
But again... if you watch the DF video, you dont walk away from it thinking these two consoles both run 60fps mode with RT on, almost equally.
You just notice the two cherry picked stress points (or performance bug issues) DF ran into.
If lateron a patch removes this.... do you think DF appoligies for its representation in this video? and does another one, comparing the two again?
Also on Dirt 5, when they were quick to go talk about potential bugs (in the video itself).
With Call of Duty, they (john) lateron says its a likely bug in a tweet.
DF handle xbox and playstation slightly differntly (imo).
They are much kinder/softer towards microsoft and xbox.