Wonderful. So can we completely disregard anything this site has to say?!
No, absolutely not. PS4 came out on 15/11/13 in the US, Xbox One came out on 22/11/13, Black Friday was 29/11/13. PS4 arguably sold faster and was very supply constrained until February. So by Black Friday there were simply not enough PS4 available in stores to keep up with demand, that's why Xbox One won back then even if PS4 won the month.
Now we know that Xbox One outsold PS4 for the last three weeks in the US (according to Microsoft) and that Xbox One outsold PS4 at Black Friday 2014 (might be 50 : 30, might be 45 : 35, but they won) and unless PS4 sold a ton in the week before BF (which it won't because at that time everybody keeps their money together for BF deals) Microsoft will take November NPD by more than 100k units. Unless Microsoft has been lying about outselling PS4 and it was just some PR spinning like "for the last three weeks we have actually sold more than PS4 sold the month before". You never know until NPD thursday.
But it makes sense. Xbox One is now cheaper than PS4. It has the more interesting exclusives this holiday season. And PS4 was always going to get to a point where demand is slowing down, it's not like the market itself has changed and there is suddenly more people willing to buy a traditional console at a given price, it's just that PS4's value proposition until some weeks ago was better and that led to more sales.
Let's just say there are X people willing to buy a console at $400. Those people look at their options and the majority chooses PS4 because it offers more for the money. But there are also Y people willing to buy a console at $300. Those people look at their options and the people choose Xbox One because they can't get a PS4 for that money. Traditionally the lower the price, the bigger the potential market, so Microsoft is just pulling in money from a different (bigger) market than Sony and that logically leads to bigger sales overall.
But of course this comes with a catch. Microsoft is selling Xbox One at a loss, Sony is selling PS4 for a profit. This holiday season Microsoft might look like the winner in terms of console numbers, but it's gonna get destroyed by Sony in terms of profitability. Microsoft can easily lose $200 million with Xbox One this holiday season in the US.