Or is it just one of Phil's balls in my throat?
XSX hasn't seemed more available in the US. Drops at major retailers have seemed further apart over the last few months. The ratio of XSS/XSX units they sell is going to have a major impact on the sales number in dollars.
I've seen more PS Direct drops than Xbox stock availability notifications if we're being honest, when looking at sources like Wario's twitter in recent weeks.