It's not out yet in Japan.
Not that it would make much difference though.
I wouldn't put too much stock in VGCharts numbers. They are always wrong then they modify their values when NPD or quarterly reports come out.
I don't know about the Wii-U selling more though. The Xbone still has third party titles on deck like COD and Assassins Creed. They will do better on the PS4 but the games are on the bone too and they're proven sellers.
Either way, they have got a lot better and hit closer to the mark over the years and besides we're looking at 10 million sold directly to consumers versus 5 million SHIPPED. It's not looking good. It's pointless to release it in Japan, it's just going to be more bad press. The Xbox 360 sold less than 2 million units in Japan. I do think the Wii-U is going to sell better than Xbone or just about the same during the holidays because of the heavy hitters and how much steam Wii U has picked up recently.