I see your point, but i feel like the Video might have been a bit biased, because CPU does often matter a lot. There are of course instances where series s runs at below 1080p but it usually runs at 60 fps or at least stable 30. An example of CPU differences is Star Wars Jedi Fallen Order. It has a 1080p Performance mode on series s and on one x and on series s it's locked 60, while it is 35-50 on one x.

The series s is definitely better than a one x. Of course it would not be worth recommending for someone with disks, but CPU and Ssd are much better and no external drive will beat the higher framerates you're getting on a series s. One x runs at a higher resolution so in that sense, it's better but it usually runs at half the framerate.