That math doesn't make sense, Xbox S is no competition for PS5 that's why it's dirt cheap. It's a glorified Nvidia Shield.
Nobody is stating that the XSS is competitive with the PS5 in terms of hardware power.
But the XSX & XSS are part of the same generation and operate the same games on two different code paths.
So they are part of the same lineage.
MS took a different path for competition by having a gimped Console & a normally powerful Console.
Sony just went with pure power.
At the end of the day, it doesn't really matter, Sony is still clobbering MS.
Even with XSS & XSX sales combined.