Utter hogwash. They were ethnic Germans living in different nations. They certainly weren't peoples of the 'German race' as such a term is inaccurate. Living in a different nation didn't change their ethnic phenotype.
Nationality stems from circumstance and is often maintained by ethnicity and acknowledgement of even smaller, provincial phenotype divisions.
You mean to tell me that ethnicities stem from nationality?
Race > Ethnicity > Nationality.
In fact, since nationality is nothing but a fanciful construct in itself, it shouldn't even be touched upon in this discussion.
.So to recap, you are not of the Aryan race, but Anglo-Saxon "race." Gotcha.