I didn't realize City had the power to cancel it on their own. Still, some strange logic to link that to Mou's hypocrisy - he messed with the pitch for years and lampooned those who were critical and yet he's here complaining about it again. Definition of hypocrisy.
Have you seen the pictures of the pitch? Regardless of what has happened in the past he is completely correct to not want to risk the players on that pitch, and I'd be pretty sure that any pitches from previous El Classicos are nothing like as bad as that. I'm also pretty sure you would feel the same if Barca were due to play on it.