Well for now here are the first five released pics on F1 2011, NOT MODED real pics
proof that they aren't moded or mad up, they are on...
http://www.connectedconsoles.com/xbox/codemasters-releases-new-f1-2011-screenshots/3635/
I think he said that because they look kind of yellow and you can't see a grove in the tyre
You can - if you look really closely.
Edit: It might be more obvious in the shot I posted above.