Hmmm, I don't know. He did say we'd get a B Sides with WTH, Push was the 2nd single, and Black Star was an instrumental. He also described Push as "hard rock" in his first review of the album.
But then he's also said some pretty legit stuff! And maybe some of the things he says gets mis-translated? I don't know, I'd like to think (hope) he is legit. But if he can't tell us, why say it? It sounds like a bit of attention seeking.