Well, nope. He said many times that sometimes the handbrake doesn't work as it should, due to paddles system. He hoped that the broblems will be resolved but they're not. Also last years DS3 had similar problems.
EDIT:
In this video (short interview before Deutschland) he says that it may be not easy rally because of his limitations and problematic parts:
https://www.facebook.com/photo.php?v=819564601395871