You said that is a fact, but is not, Raist doesn't know WW Xbox One sales in 2014 and 2015.
And we don't have any precise Xbox One shipment after 5.1 million by march 2014.
I don't "know", sure, but then there's some data and information to work with and common sense. I've made several posts about this in the past.
The counterarguments I usually see are "well this person said that" or "surely the XB1 must have sold X because reasons".