No, what he's saying is that Nintendo sold about 700,000 Units, while Sony only Sold 500,000 units. It's saying "Nintendo Sold 200,000 More then Sony Did in X Amount of Time".
OT: I knew Vita wasn't going to sell well. Maybe it will sell fine here in the States when it's launched, but I have this feeling it's gonna be a repeat of the PSP: It won't get the support the Nintendo Console will have, it won't sell at a large number, and it will be so screwed that no one will want to support it, and thus it'll become a useless piece of junk... like my Old PSP that no longer works. Nintendo just has the corner on this market, and unlike Sega who matched Nintendo, took steps to fight it, and thus made home Consoles a match instead of a Nintendo Dominated thing, no one was able to compete with the Gameboy (The Game Gear and Lynx were nice to look at but had such short battery life and were so huge, that no one was gonna stick with it when the Gameboy had Fun games, long life and fit in your pocket easily).