That largely depends on who you are. If you're Jewish, it is a fantasy story.
If you're an Afrikaner or a Rhodesian, you live like a king.
But if you're an African, you have neither civil rights, nor the ability to profit from a nation's mineral wealth.
I don't think it's quite that simple. TTL's Black Africans have the disadvantage that they are in many places still controlled by a white elite; on the other hand TTL's Africa has received a lot more development and industrialization.
I think it really depends on what part of Africa we're talking about. The place where black Africans probably have the highest standard of living is Gabon, which is being integrated into France like OTL's French Guiana was, which means a massive amount of wealth flowing from Metropolitan France to Gabon.
Places like Uganda, Malawi, Tanzania will also be doing pretty well relative to OTL: they have achieved full independence and majority rule, and have the advantage of having a rich industrialized state on their border (Kenya) to trade with.
Black Kenyans, Angolans, and Mozambicans are probably doing a bit worse than in OTL. Their countries will be richer overall, but the wealth will take a long time to flow down from the (usually white) elites.On the other hand, at least TTL Angola didn't have to endure a 20 year civil war.
Black Rhodesians are probably doing better than OTL's Zimbabweans, but that says more about Mugabe's catastrophic leadership than the merits of TTL's white minority control.
Black South Africans have the worst circumstances. In OTL, Apartheid ended, but in TTL, it hasn't :/
So, yeah, some things in TTL are better for Black Africans, and other things are worse.