My issue with this take is that the egyptians wrote literally everything technical down. You see this in math, embalming techniques, medicine, architecture, etc. It seems like the more valuable the info, the more likely they were to preserve it in those tombs or in stone wall. Why would such valuable technical info (like what you're describing) be ommited from the record?
Furthermore, why would the literate people who later conquered egypt have these valuable tools completely missing from their own records?
More damning than the lack of info in their own egyptian records, is the lack of magical tech in their literate enemy's records. Their enemies wouldve had no incentive to aide the Egyptians in (alleged) deception and no incentive to make them look better than they actually were.
(As an unrelated note, this is the same hole in the moon landing/flat earth conspiracies)
All of History -
The written records that we posses
Is like 10000 years old. And I think 10000 actually generous. No Google
So ..
The forgotten era would have to have died and become dust before the ancient Egyptians
Are there any records
OF ANY KIND
that detail the building of the pyramids? How they quarries the stone and moved it..
So by your logic the pyramids don't exist. But they are there
Same way the records you're imagining might also have vanished to time.
The Egyptians prolly found the pyramids already built