This is so sketchy and confusing. Microsoft doesn't provide official sold-through numbers themselves, and this very forum (among many others) have questioned VGChartz's credibility multiple times in the past for sometimes having "not quite right" estimates...yet now they are somehow verified as an accurate website by Aaron Greenburg retweeting them on providing numbers based on estimates that on MS's end are based on sold-in (to retailers) because Microsoft does not provide sold-through numbers of their own?
But...Aaron works for Microsoft so he would know the actual sold-through numbers? And if he's retweeting VGChartz's numbers then shouldn't Microsoft themselves also provide official numbers of sold-through globally, or are they afraid that will set people to expect them to do so regularly going forward? At the same time, if the Series systems are really tracking ahead sold-through over 360, wouldn't you as a corporation feel good enough about that and future projected sales to just put the numbers out there officially to shut down any doubts for good?
Other than that, I'm not going to pretend Series aren't doing well. However I think all of these claims come with some big grains of salt. IIRC the 360 was also supply-constrained for a bit and it took a little bit for supply to start catching up with demand (which was ever-growing over the months and then really picked up when Halo 3, Gears, Mass Effect, etc. were shown and about to be released combined with Sony's E3 disaster for PS3). And IMHO; if 360 had supply to match demand in its first 17 months, I think the numbers would be to the effect where Series would not be trending ahead of it sales-wise. 360's early library from 2005 - 2007 just looked a lot stronger on the 1P & 3P AAA side compared to what Series have had, for what's been released so far. Not to mention, 360 also had a cheaper model (with the same specs processing-wise) and an arguably bigger UI/OS/online services impact as well.
I'm glad Series are selling well this gen so far (though I wish the ratio was in favor of Series X vs. Series S), but I've also seen some people, mainly content creators, try to play this up as some massive momentum shift that will be longer-term, particularly at the detriment of PS5. Which realistically speaking, will simply not be the case unless Sony just outright fails to increase supply for another year or two. Otherwise I think what we're seeing is a reflect mainly driven by supply; that's for BOTH Xbox and PlayStation tbh but outside of the U.S and maybe the U.K, global demand for PlayStation is just magnitudes higher and that shouldn't be a controversial statement.
If supply for PS5 were able to meet demand, I actually don't think Series sales would suffer too much (especially if many are Series X units), and could actually see further increases. However I don't think you see any gap closing and potentially a gap widening somewhat in PS5's favor would be the likely outcome. Honestly tho this has nothing really to do with what I think sales would look like with supply normalized to satisfy demand or whatever; it's about Aaron quote-tweeting sales estimates from a website that hasn't exactly been totally right multiple times in the past, when he could just also officially state what actual sold-through numbers for Series are globally especially if it's trending this far ahead of 360 (allegedly).