He said that because the Wii is far stronger than the PSP. If an HD game can get a clean port to the most pirated, least cared about system, than why not the system the largest install base? This is the BS that most Nintendo fans talk about. Dante's Inferno, Split/Second, Army of Two: The 40th Day, and many others all made it to the PSP, and were ported from the HD consoles. When asked about why a certain game didn't make it to the Wii, a dev's first excuse is "It can't handle the graphics". If the PSP can handle the graphics tan the Wii definetly could. That is why he mentioned Split/Second
What if the most pirated/least cared(wtf?) system still manages to sell better when it comes to racers?
Now as you can see, there are 2 million selling racers on Wii while there is 9 million selling racers on PSP. Granted, there is the one 26m selling racer on Wii but as the developers can't put Mario on the game, PSP looks to have a better chance of moving software.