My "guess" is the Ancient Egyptians built the pyramids consistent with the tools and engineering we know they possessed. But my guess is a logical conclusion based on recoverd artifacts and writings. These artifacts include copper chisels, copper manual impact drills, copper saws with sand as the abrasive, smoothing stones, cubit rods, and some elementary math written in papyri.
In my humble opinion construction did NOT include;
Spaceships, ancient vanished civilizations, lost advanced sciences, forgotten machinery, advanced computing, direct contact with aliens. 12,0100 year old hidden agendas, or any of that fringe stuff.
Jammer
PS; Might I assume you might find the statement "The Greeks couldn't have built their civilization without external aid, they were too primitive" insulting.
Why would the Egyptians be any less insulted?