First, the data is only representative of Japan.
Second, the data doesn't really say anything about the consoles social aspect. It only asks household user counts. It doesn't say anything about them playing together. Also, what are the specifications to be a "user"? Did grandma make a mii, therefore she's a user?
To be fair, I have little doubt that the "household user counts" would play together, at least on occasion, and that most 360 owners play on the lonesome (especially in Japan), but the statistics aren't all that interesting.
Also, when I play 360, I usually do so by myself to get some me time in my den. I socialize away from my television on most occasions.