I've been sent some more data thanks to @Welfare that shows we overtracked the Xbox Series X|S from January 2021 to October 2021 by roughly 210,000 units in the US. Taking a quick look most of the difference occurred in January, February, and October. I'm working on the adjustments right now.
okay, so then the front page will show 15.16m instead of 15.37m. 5.3m gap between Series and PS5 instead of 5.09m