"...there is living amongst us a non-German, foreign race, unwilling and unable to sacrifice its racial characteristics, to deny its feeling, thinking and striving, and which none the less possesses all the political rights that we ourselves have."
It's an odd hypothetical which posits the existence of a group that took the same role that the Jews did for Hitler - unable to assimilate because of cultural incompatibility, lack of loyalty to their nation-state, and this being true as a result of a self-isolation of the members of that community.
Or perhaps its a cheap shot to appeal to literal Nazis. How about the contemporary far-right?
"The Islamic culture is inferior to our Western culture... Mass immigration from Islamic countries means more crime, more terror, more anti-Semitism, and less freedom and democracy. Integration is impossible because Islam is not just a religion, but a totalitarian political ideology."
It's almost as if framing the problem as "the minority has big issues integrating" is in itself a kind of dogwhistle, a poisoning the well toward a racist explanation and therefore racist solution.