To the extent that contemporary Germans identify as 'Germans' and see themselves as in some way connected to a 'Germanness' that goes back before 1945 - whether it be Beethoven and Goethe, or Prussia or 1848 or whatever, then that also includes the Nazis and the Holocaust. That is also true for the descendants of postwar immigants who identify as 'German' in such a way.

And a clarification on the anti-semitism - it isn't racism plus conspiracy theories, but rather that conspiracy theories are one of the key components of anti-semitism.