Nah, he ain't that. He's mainly left leaning, and has no qualms addressing when local minorities have antidemocratic sentiments, while not condemning immigration itself. I can understand why it's hard to describe in one sentence to grab attention, because he might be left, but supports rightwing measures vs. immigrants who refuse to partake in the normal social context in germany and which are creating parallel societies where things like honor killings and the inofficial applying of sharia law are ok.
There are both leftwing and rightwing positions there, but from my perspective, he's the type of left-wing person we need: the type that has realized that the paradoxon of tolerance will fuck them up if they don't change something.