They aren't?
What ethnicity are the Muslim Germans? Are they more ethnically German than your typical Austrian?
I’m just saying, when nationalities get mixed into ethnic titles it gets to be a muddied soup. Dylan shouldn’t be held to scholarly rules of speaking when making a general statement.
And yes, there are ethnic Germans, usually referred to as ethnic Germans, or Germanic, to differentiate them from German nationals. Just like there are Croatian Serbs (ethnic Serbs living in Croatia). Although there are more Serbian Croats.
I remember picking on some guy in a newspaper comments section who said the U.S. was “racist” for attacking Afghanistan. I asked, since the majority Pashtuns were considered caucasian, if that meant the U.S. hated white people?
I shall have to inform my father, who grew up in a household in southeastern Pennsylania where his parents still spoke Plattdeutsch around the house after five generations in America that he has no particular ethnicity. All the more surprising since what he thought were his “German” ancestors actually arrived in America from der Sudentenland and die Scwheiz.