He endorses a demonstrably bigoted right-authoritarian party - specifically for its attitudes toward minorities and foreign nationals. Their policy on immigration is “don’t.” Their stated goals involve mass deportation. They explicitly claim “the concept of multicultural society has failed” and “Islam does not belong in Germany.” Naturally they’re also big mad about women being equal and gay people existing. They were always extreme nationalists, and then a couple years ago their old leadership split off because their own party was starting to scare them, and as a direct result these German-nationalist Christian-supremacist anti-minority nutjobs got even more blatant.
They’re Nazis. He endorses Nazis. He is loudly and openly throwing in his lot, with Nazis.