Except that it also contains recent Ugandan immigrants who moved here by choice and work as surgeons. Just like white, it's a big umbrella and rough category.
I agree that there's complexity there, but it's worth noting that it is a point of moderate contention whether those immigrants share the Black identity or just the black identity. More knowledgeable theorists than myself (and notably those actually party to these identities) have discussed this at more depth, and I recommend digging into it if you're interested.
I'm not digging into racial pseudoscience, nor do I have any interest in such. Are these the same types of people who say that being on time and respectful are "white" values? Those people are stupid and/or malicious.