That's not what I said at all. Wii, 360, PS3 are one grouping, whoever sells the most out of those three wins. PS2 sales count when comparing it against its own generation. You'll notice no one is really harping over the fact that PS2 is outselling 360 and PS3 in the US most months either, and that's cause the PS2 doesn't really affect the current market anymore.
You'd make a better argument comparing PS3+360 sales vs Wii sales, since PS3 and 360 actually share market space and are both relevant to the outcome of this generation.