The concepts of "right wing", and "radical right" are not truly meaningful, since they do no connect to the historical concept of "right wing politics", nor do they say anything specific about political views. So how about just calling things by their most obvious names: The AfD is essentially defined by being anti-EU and anti-immigration, and since recently anti-government COVID policy. Wouldn't you agree that this captures fairly accurately what the AfD is?
And just another thing: why would it matter at all who created that satirical stunt? From my perspective the satire itself is the only thing of importance. Think about the music of Richard Wagner: by most historical accounts Wagner was, on the personal and social level, a really nasty piece of work. But his music is still wonderful, and loved the world over. Should people stop loving his music, because he was an unpleasant person?