Yeah, that's true. Like when they didn't hit 4 million Wiis at the end of the year, Nintendo was all like, "if you include all the ones in the shipping channel"...so they meant 4 million "shipped", not sold (or they're just saving face after the fact, whatever).
Sony can say whatever it wants about shipping, the fact is Wii is kicking its butt. Sony counteracts with the usual spin: "People will lose interest because of the graphics..." Maybe that's true, but if you believe that people buy game systems for the games, then graphics don't matter that much and Nintendo's current sales bode very well.