How's the CSU authoritarian? That's like throwing expletives around; you might as well call them Nazis and get it over with.
As for calling them Nazis... well, when one looks at the events regarding former Verfassungsschutz chef Maaßen, instituted by HP Friedrich and protected by successor Seehofer until it was no longer tenable, who is accused of having protected the AfD during his term: it's not that far to at least imply ideological support or tolerance toward far right political positions.
relevant?
Yet more proof that "Conservatism is progressivism driving the speed limit". And the speed limit seems to be rather generous in this case. But for some it's never high enough, they'd pull down all of Chesterton's fences at the merest whim.