Unless Morrissey is more familiar with zoological taxonomy than I'm giving him credit for he may have started that sentence gaily accelerating towards saying that the Chinese were "sub-human" before a self-censoring synapse intervened and persuaded him to say "sub species" instead. As he said it there must have been a Homer Simpson thought bubble above his head admitting "I don't have a clue what this term means - why didn't I just say they were horrible to animals?".
Why does he do it? Most of us have never known the erotic thrill of being invited to say anything we like into a tape recorder. Just imagine that feeling. It's powerful medicine. For an egomaniac like Morrissey it's a reason for living. And for a personality like him, who only knows what he thinks when he hears himself saying it, it's a permanent invitation to get himself into trouble.
The Guardian prints the whole interview and then editorialises about how shocking it is, so they get to have it both ways. The twitterati will huff and they will puff. Funny how "Disgusted Of Tunbridge Wells" seems to have so quickly given way to "Appalled of Stoke Newington".
World turns. Chinese wonder who this Morrissey is.