Whatever the source; its racist garbage.
There are examples of the worst kind to be found about every lineage of humans. And the best.
Many of the problems that are seen in some types of cultures here on the US; are based on family history or the LBJ created welfare state that has created generational issues. Not genetics.
God created us all with equal worth and equal value.
What you posted is right out of some type of white supremacist or Josef Mengele type of poison.
There is no place for type of thinking here.
So you have evidence that pre-contact sub-Saharan blacks DID forge metal, weave cloth, build irrigation systems, create a written language, create a system of social laws, engage in oceanic ventures and other things? If so, there is probably a Nobel prize in store for you.
The facts are, they didn’t. And if you want to fantasize that they did, if that will make you feel better; knock yourself out.
But be mature enough to realize fact when it smacks you upside the head. Some people invent, some people sit and remain stagnant. Some cultures advance and some are STILL, after generations of sitting with their hands out, STILL completely dependent upon the charity of others to maintain subsistence living. Christian churches have been feeding, clothing and helping some of these countries for 60+ years. If what you say is so blatantly “racist”; please let me know when you expect these countries to be able to stand on their own and feed themselves?