I could be missing something, but these guy's vids don't seem to come with many explanations.
What I gathered from the vid:
XsS - 1080p, 60fps
PS5 and XsX - 4k, 60 fps
I don't see any dips in framerate on the graph he uses in he vid, but again, I am not sure this guy is the best at putting together an analysis
here is his resolution side by side, and as far as framerate I don't see the line go below 60 in any of the versions he shows
throughout the vid, the XsS version definitely looks muddier than PS5 and XsX version. XsX and PS5 look identical, to me, but maybe someone with a keener eye can find spots where there differences and screen cap them for us