This is an absolute game changer.
Since Napoleon's era, fringe cranks have written volumes of conjecture that most of the pyramids were actually built by other societies much earlier than the Pharoahs. They suggested that the ruling classes had in fact removed earlier corpses and placed their own children into them to give them a truly royal burial.
If this is true, it means that 99% of the historical re-enactments and documentaries you have seen on ancient Egypt are all rubbish. To think of the tax money wasted by public television on this gibberish is galling. A lot of money and propaganda so academics could pretend to have it figured out and give the impression there were no questions left. In fact, they had no answers of any kind.