HD DVD is killing BD in non-console related hardware sales. So they have to add the PS3 to look good. The HD DVD PRG will announce the non-add ons at 500,000 units likely next week once it's official then they'll state that 1M total has been reached by the end of the year (with about 600,000 of them stand alones).
The comparison of PS3 "gaming" sales against other gaming consoles has nothing to do with how the number of PS3 sales, which is much larger than HD DVD or BD stand-alone player sales, might impact competition between high-def format software sales. That's obvious. If it's fair to talk about the 360 add-on then its fair to talk about the PS3.