It is classic Nazi rhetoric and uses the same scapegoat that Anders Breivik used to justify the mass murder of more than 70 teenagers in Norway.
It's awful, but I'm not sure how exactly you think that would factor in or be relevant in a possible court case. I'm fairly certain the bar of evidence is a bit higher than "they share talking points with other Nazis".
While that's a common talking point on the right, that's not even what the statement is saying. The only ones who are clearly villified in it are the people in power and they're even brandished as supposedly "unconstitutional" (implying the Afd is on the side of the constitution).
It's still complete hogwash of course and pure conspiracy thinking that is gross and detestable in several different ways.
I don't disagree. My point is only that just saying/claiming that by itself isn't going to hold up in court. If it were, Weidel would have long been sued and found guilty of "Volksverhetzung" for statements like that. But these people, at least the more cunning ones, know how to couch their hate in words that generate some degree of plausible deniability and let their followers fill out the blanks.