And consider that things can be a lot more "down to earth" while still having some unexplained mysteries.
The Egyptians may have referred to themselves as a legacy civilization who inherited certain things from "those who came before them". They very likely did not imply any form of superpowers but instead reverance for skills the Egyptians didn't have. See e.g. the work by https://www.youtube.com/channel/UC2Stn8atEra7SMdPWyQoSLA especially recent work analyzing (i.e. advanced metrology) predynastic vases that seem too good to be true.