It's actually more the case that lots of "migrants" are now essentially lumped in with "bio Germans". So, the definition is expanding, to continue to encompass a majority.
Same way Americans are redefining "white".
Discussion
ye it becomes kinda meaningless to define someone as migrant after a couple generations deep
idk if it's comparable, ethnicity vs nationality
well eventually they merge and it then depends on who writes the history books what bc og or not i guess
bc=becomes