Ybarra already shot the data down as incorrect:
Of course, Ars also did that themselves in the article, admitting the data can't accurately be extrapolated for the entire userbase:
All of these sources of potential error make us uncomfortable using our data to directly extrapolate total sales or usage numbers for the entire Xbox playerbase. The numbers and ratios presented in this report should only be considered representative, sampled estimates of the online portion of the Xbox community, which could be significantly different from the total community of Xbox owners. You can try to multiply out our percentages by reported hardware sales numbers if you want, but we wouldn’t stand behind that extrapolation.
I don't know why this false narrative is going on in the thread about how BC was viewed by many here as a "game changer", personally I don't remember anyone saying that. Is this something one of the permabanned Xbox trolls said or something? Or "oh hey MS won E3 just with BC!!" uh, who cares? Thats their opinion. We had people here who claimed Sony won E3 a couple years ago just for Shenmue 3, a fucking Kickstarter, which isn't even close to release two years later. Maybe the two or three people who maybe claimed here that MS won E3 just because of BC, actually use the shit out of BC.
Most people here understood it was nothing but awesome fan service, which is exactly what it was supposed to be. Also, this number is going to grow a lot with the awesome Xbox GamePass service :)