The closest I can find is David’s Staff Report that specifically addresses the issue Was Cleopatra black?.
Most of this seems to be a bit of the sort of Historical Revisionism that let Geoffrey of Monmouth have King Arthur conquer Rome to prove that the Brits were as good as anyone else. Unfortunately, historiography has moved on, a bit, from the 12th century and we tend to hold such claims to tighter scrutiny.
There are two types of information that are genuine that tend to provide support for people who dearly want to believe this sort of historical invention. On the one hand, there have been genuine contributions by blacks that have been ignored by history. (Garret Morgan was a black businessman and inventor who patented a gas mask and a traffic light, yet was generally ignored for years. He actually used his gas mask to enter a gas-filled tunnel with his brother to rescue several miners trapped under Lake Erie during the cnstruction of the Cleveland water intake pipe, but was noted in the newspapers of the day simply as “two colored men helped in the rescue.”) On the other hand, there are cases where blacks have probably been involved to some extent that have been traditionally portrayed as purely “white” endeavors. (There are strong suggestions–I have not seen conclusive proof–that Beethoven had one black grandparent.)
Egypt tends to fall into the later category. In the course of its 3,000 years of pre-Roman history, the Nile valley was constantly subject to invasions and migrations of many peoples. While the people on the Lower Nile are generally regarded as white in history books that extoll the beginning of civilization (and were often seen as non-white when European powers wanted to exert control over the region), the people of the Upper Nile are Nubians. In the course of several periods, the Egyptians conquered the Nubians, the Nubians conquered the Egyptians, and they actually maintained a joint kingdom for a period or two. During these periods of conquest or cooperation, the people tended to intermix to some extent and we have Egyptian paintings that display emperors with both “white” or with “black” features (depending on who looks at the paintings and what axe they are grinding).
Given the contradictory approach among some Europeans and Americans regarding the “white” founders of civilization and the “non-white” current inhabitants of Egypt, it is not difficult for some people with their own agendas to turn that inconsistency into a declaration that the whites “stole” the “black” civilization.
Having established the initial premise, of course, some later writers have gone hog wild in their claims for “theft” of technology and culture, asserting that all Egyptians were really sub-Saharan Africans and that all technology originated with them. (There is even an extreme couple of nuts who claim that all the civilizations of the Americas were actually a gift from a great sea-faring African. It is interesting to see them try to re-write history in such a way that they deprive the Americans of the ability to build their own civilizations, but when you’re on a roll, you ride it, I guess.)
The Greeks actually did inherit (or take) much of their technological information from the Egyptians. They were quite open in their acknowledgement of that debt, however, never claiming that they had invented it and always acknowledging the Egyptian influence. (In fact, they blended attributes of Hermes with those of the Egyptian god Thoth/Tehoti, giving Hermes the title Tresmagister (thrice great) for his Egyptian-associated knowledge.) As to the Egyptians, they were the Egyptians. They included many people from Africa and Asia who wandered back and forth across their land. The contradictory attitudes of the people who wrote about “white” Egyptian civilization and “dark” “backwards” Egyptians who needed colonial rule to regulate them are a good reflection on the varied backgrounds of the people who have long lived in the Nile Valley.