Microsoft paid more for priority so obviously they have more stock, also for every failed Series X due to yields they can create two Series S consoles so also of course there's tons of those in the market.Honestly feel like Starfield is going to be a big test of XBox marketability this gen.
Series consoles are easy to get, so honestly not THAT supply constrained. Series S isn't supply constrained AT ALL and Series X is basically available online indefinitely. MS just doesn't have enough stock to ship to retailers many units, but has enough to essentially feed the online stores of amazon, Target, and others.
It's just not as popular of a platform, by a wide margin. If this brings you some joy as though your team won and you feel like celebrating and "neener-neener-ing" you need to grow up though. (and if this hurts you and you feel the need to spin it, same thing)