He's going too far here. It's true that many German Jews went to great lengths to identify with Germany and express their loyalty to it, but there were significant figures who felt alientated from Germany and even hostile to it. They were a minority and perhaps they had good reason for their feelings, but it won't do to deny that such attitudes existed. And what positions did Jews occupy in Germany that they haven't held in the US?
Plus, Pan-Germanism, which was explicitly and volubly anti-Semitic, had been articulated in the 1880's as a buttress of a frustrated German nationality. Its influence was already quite strong, as was traditional anti-Semitism, before the Great War.
Barbara Tuchman traces some of the early anti-Semitic laws of Germany to the Black Death, and to rumors that Jews had somehow caused the epidemic by poisoning wells with some esoteric substance known to them and secretly held.
The prohibition against Jewish ownership of real property and the urbanization of the German Jews was one of the early consequences of that 14th-century outburst of anti-Semitism.
Any refusenik group that rejects society's norms or refuses to identify with the rest of society gets this treatment. As an example, the early Christians faced ghoulish rumors about them based on distorted descriptions of their sacraments ("drinking blood", etc.) -- this in a society that knew the taurobolium, the Asiatic "baptism of blood" that featured the slaughter of a live bull, and the ecstatic self-castrations of the priests of Cottyto.
Paul of Tarsus was prosecuted for practicing a "gutter religion" not sanctioned by the otherwise complaisant policy of Rome -- and the complaint against him was instituted by the Jews, as a matter of fact.
I don't think the author, however, overstates Hitler's determination to kill every Jew he could get his hands on -- with certain exceptions, such as those miserable Jews who were helping the Nazis hunt down other Jews.
I do query the statement about the prevalence of final degrees among SS officers in the death camps, however. Without having any reason to reject the number, it just sounds frankly incredible.