The effect of immigration of PhD students and skilled workers is most noticeable among the Asian American population the overall population of Asian American people is small. In contrast, the immigration of PhD students and skilled workers from Europe or Africa does not define their racial or ethnic groups, because their numbers are small relative to the overall populations of European American and African American people.
But most people see race or ethnicity first, rather than noticing that the immigrant PhD students skilled workers have much more in common with each other in terms of advantages for their (future) kids education, compared to other members of their respective racial or ethnic groups.