Yes, i'm sure they found a frame drop for half a second somewhere but the average is virtually non existent.
If you are comparing two different versions of a v-sync'd game and one is locked to 60 when the other drops even 1 frame below 60 then thats an issue because it will introduce a stutter on one and not the other. The average fps isn't the issue then because for that one moment on one system it was perfectly smooth and on the other you got a v-sync stutter which amounts to the game having a 33.33ms frametime for that moment, ie same as 30fps.
You can see this in RE8s RT mode, where PS5 drops single frames from 60 at points (introducing that stutter) where the XSX is locked to 60, so its much better overall experience on XSX. Average fps matter a fuck if you are dropping one frame every 10 seconds and having a constant stutter, in that case you will have a much better experience dropping the res slightly.
If both were dropping under 60 at the same time and one was 58 and the other was 57 then it makes basically no difference visually then.
I don't care who wins here I'm just telling you this stuff so you can see the whole picture, its not just the range of the DRS or the average FPS on paper, its what actually happens when you play it. I do agree that most people don't notice these sorts of dips and would more notice blurriness from a sharp drop in resolution, but if we are evaluating performance and you want to know how good it actually feels to play/watch you to critically analyze it outside of just average fps and DRS range.