“Sold out” doesn’t mean anything. For the last four generations, Sony has deliberately underproduced consoles at launch, specifically to claim ‘It’s flying off shelves! We can’t keep it stocked!’ This free publicity stunt even worked for the PS3… which struggled for years.
That said, yeah, apparently the Xbox whatever-it’s-called sells about half as many units per year, compared to either the PS5 or Switch. Rough.