I doesn't say what the sales are, apart from their location, so we are just assuming that they include PSN sales rather than VGC numbers being massively under tracked
As for the PSN sales of GT PSP, it is avaliable for free still with a new PSP go, it is a choice of that, Motorstorm Artic Edge or Assassin's Creed
http://blog.eu.playstation.com/2010/01/15/weve-extended-our-pspgo-free-game-offer/