You create a thread titled "The lies of Slightly Mad (Project Cars)", quote an article from a year and a half ago, and then contribute nothing more than a "No comment"?
Quality thread, OP. Why not just post your "No comment" in this thread?
http://gamrconnect.vgchartz.com/thread.php?id=203293
Edit: Actually, it looks like you did.
It's clear from this article and from the article in the above thread, that they really wanted to create a quality Wii U version of their game. They even say in the article you posted above "We could reach a fairly solid 30FPS but it might take a hell of a lot of work.". A year and a half months ago they acknowledged it was going to be difficult to achieve this. In the end, they just weren't able to make it happen. This doesn't make them liars.
EDIT: I see that the "30FPS" comment is not from the first article, but from a more recent article. Doesn't really change anything. They thought they could achieve 30FPS, but in the end they just couldn't make it work. This happens all of the time in development.