What does the link say?
Because im getting the same idea as 5n0man.
Xbox Series S will run current generation console games in Xbox One S mode and not Xbox One X mode.
For example, games like Resident Evil 3, DMC 5, Dark Souls, Halo Master Chief Collection etc. will run with the frame rate and resolution caps of the Xbox One S versions of the game and not the Xbox One X versions. In addition, for titles such as Red Dead 1, Call of Duty 4 and other titles from the Xbox 360 era and earlier will also 'only' run the Xbox One S versions of the games and not the 4K enhanced Xbox One X versions.
Basically, Series S wont run any Xbox One X enhanced titles. It will run Xbox One S versions of games with minor visual upgrades and Xbox Series X games with major visual downgrades. Its the in-between console for the low.
I made a post about this in the '
How Will the Series S Affect Next Gen Multi's and the Series X?' thread a couple of days ago. Got confirmation to my theory real quick.