The headline isn’t accurate at all. There were people with Jewish ancestors who fought with the Nazis but they weren’t assimilated Jews. Almost none were Jewish halchicly and they weren’t people who actively assimilated themselves .
Also the number 150,000 sounds way to high.
That said the concept is true. I used to wonder how secular Jews in America were so indifferent to the holocaust and even sabotaged rescue efforts. I was sure that today things would be different .Until there starting being groups like J Street . They would act the exact way .