Where do you get this? MS launched in many regions and now are shipping the second shipment to retailers. Sony is launching in EU on Black Friday.
The article says MS May have an edge. MAY. With Sony launching in Europe tomorrow, I would not doubt that MS can get more units to NA shelves tomorrow. This has nothing to do with who sold the most in 1 territory. From the reports it looks like MS and Sony shipped a similar amount of units for their launches but spread them out differently.
And you're basing this assumption exactly on what?
We don't know how many PS4s Sony shipped to Europe yet. If they matched NA launch and shipped 1m here, which seems plausible, then they have a total of 2m PS4 shipped (assuming they have not restocked NA stores in the last 2 weeks at all).
It's simply not possible for MS to have shipped another 1m after their launch one week ago (hell, here in Europe a lot of retailers are still carrying unsold day 1 editions, but sell-through is OT here), so logic suggests difference in shipped units for November is going to be 2:1 at the very least.