That right there tells you "exclusives" aren't as important as being the best at running all the 3rd party games. You can take almost any NPD top 20 list for ps4 and xbone each month and 15 or more are on both lists. Being the best version of those 15 and your system will have a better chance at being the sales leader. 360 did this in America last gen.
Exclusives tend to be how one manufacturer can differentiate themselves from another. Being "best" (read: higher resolution and/or framerates) is not necessarily something that makes a meaningful difference in sales.
The reasons that 360 outperformed the PS3 in the US are one, releasing a year earlier, and two, being much cheaper. The 360 was $299/$399 at launch vs the $499/$599 of the PS3 that was released a year later.
The XB1 X is not a cheap console at $499 and is not a new generation, so it would not get as much of a boost from early adopters. After all, if someone is looking to play XB1 games then they can get an XB1 S for much cheaper and have money left over to buy said games.
Will the X boost the XB1 family to #1 in NPD charts in November and December? It really depends on how many are upgrading. The XB1 X, like the PS4 Pro, is not really machine for new owners. Those that have not purchased an XB1 at this point in the generation are more likely to be price sensitive buyers, and as such, unlikely to choose the $499 console vs the cheaper $249 (current price) XB1 S.
Looking at a thread on last December's number the PS4 Pro was 15% of total PS4 consoles sold (238K out of 1,568K). I honestly do not see the XB1 X doing better with a console that is also $100 more. I would really peg the X at around 600k total over Nov and Dec and honesty think that all of these million plus predictions are rather bold.
Just a final reminder; the X is not competing against just the PS4 Pro, but also the PS4, Switch, and XB1 S as well. While Microsoft would probably prefer someone purchase the X; they'd be happy if that individual opted for an S instead since it is still an xbox.