It really isn't a stretch from that point to adopt the notion that the Egyptians didn't build them after all, or at least not the ones we celebrate.
The above is exactly my viewpoint on the matter.
Applying simple logic to the existing hard evidence has led me to the inescapable conclusion that, someone other than the dynastic Egyptians built the megalithic monuments in that country.
Likewise with the megalithic structures of Central America, Japan, New Zealand, Mexico, Easter Island, India, and many other places.
Westerners have been puzzling over the origin of these monuments since they first encountered them centuries ago. When they asked the local populations about the origins of those structures, they were consistently told, "They were built by the gods."
One of the earliest examples of that, is of an incident related by the Greek philosopher Solon (forebear of Plato), who asked the Egyptian priests about the origins of that country's great monuments. When asked, the priests gave him the same answer as was given to the Spanish conquistadors, centuries later.
Weirdly, westerners seem to have consistently rejected those testimonies from the people who should know best. Westerners are still rejecting that explanation to this very day. We're now locked into a hardened view that all such structures MUST have been built by the ancient civilizations we're aware of -- arrogantly dismissing the possibility that we could be unaware of advanced civilizations that preceded the ancient cultures that we're familiar with.
Graham Hancock's theory that an advanced, lost civilization, was wiped out by a worldwide cataclysm, makes the most sense. In my view, his theory will one day become the dominant, mainstream view of this enigma.
The artifacts that are the most perplexing to me are the ones found in coal. Those would have to predate the Egyptians by eons. You are right, most people just refuse to consider all of the wondrous enigmas. Our Earth keeps springing some surprises on us, some of which tip our conclusions regarding our origins on end. It is easier to ignore them it seems.
I think I ponder this stuff too much. I used to live and breathe such things, including UFO lore. Then it began to frustrate me to be forever held in some weird never-to-know state of curiosity. I can actually taste this stuff, but had to push it all to the back burner just to live in the here and now. A venture into the unknown from time to time is good for my soul. You would probably take me for a loon if you got me started on the apparent spiritual aspects of UFO related lore. My best guess is that it is all related.
My favorite thing used to be getting the clergy to discuss Genesis 6:1 with me. That chunk of Scripture plays into our current subject quite handily.