Yes there is greater diversity between individuals than any group.
Although true, I didn't mention that, nor is it relevant for this discussion.
There are however obvious and distinct differences between peoples of differing geographies.
That is true.
But for different geographies within Africa as well. There isn't one African type.
Most studies, perhaps not surprisingly, focus on African-American, which should not be extended to "African" or "Black" at all. African-Americans did not come from all African regions. So, it shouldn't be extrapolated to all Africans, or to any "negroid" group.
I'd prefer to be cautious.
Sadly, most research is still very much white-centric. Us and them.
The map shows the main origins of African-Americans. Mostly from West-Africa. We can't extrapolate that the rest of Africa, or people of African roots in other countries have the same prevalence of any condition.
We can't also assume that just because someone looks more black or white that their DNA is mostly of black or white heritage, respectively. Which renders the whole classification into races meaningless.
Particularly at individual level.
Which is another reason for the doctor not to mention race associations to an individual patient. What was it supposed to achieve at this stage?
If he offered earlier diagnosis, then perhaps it would have been relevant.