Its's definitely a very interesting notion! Personally I do believe that with the right amount of willpower, enthusiasm and patience people could achieve this level of precision and strength to build this. As for all the mathematics, I don't know how much of that is true or even intended. Sure, these days it's hard to reach this level of precision, but that doesn't mean it's impossible. I remember a high-speed video some duo was making and they needed to drop something exactly at the same time. Turned out when slowed down, they had matched each other on a robotic level of precision! So I guess we are capable of way more then we probably know ourselves :).
That being said, if it actually was another civilization then why are the insides all about the ancient Egypts? Is that a way of masking the true builders of the piramids?
Eventually though, I know way too less about it to have an opinion of any value anyway, but it's a nice subject to entertain your mind with!
Cool! Thanks for reading and grateful for your reflective comment :)) Super interesting what you mentioned on the high-speed video duo!! There is so much to life that we still don't know..... And as you say it doesn't mean its impossible. I have this belief that all we can imagine is something that we human in some way or the other in present time or in 1000 of years will manage to accomplish and figure ways how to solve.. Well thats another road to go down.. But yes, this subject is absolutely intriguing and perhaps one day will find some answers.. hehe! Have a wonderful day. Thanks for sharing :D