The lies of Slightly Mad (Project Cars) Head of the studio confess that they were overpromising

[Vodacixi]

They are a bunch of liars and the ones saying the opposite are either not well documented about the topic or just blind. Because really, if at one point they say that they are implementing a lot of awesome effects on the Wii U version like particle shadows and that despite the technical difficulties the Wii U can move the game just fine without mentioning any problem with the performance at all and now suddenly the say the console can't run the game... c'mon, it's so damn obvious they're lying! If the game runs at 23fps now it did it back then as well. But they didn't say anything, which is rather suspicious.