I'm endlessly fascinated by the intelligence of our forebears, in all different ethnic regions. Just the mathematics they had a grasp of is impressive, they were just as smart as people are now but didn't have the knowledge base on which to continue building.
And I think where things like the video posted above go wrong is they underestimate the intelligence of our forebears.
Fitted walls for example. It's the most efficient way to work with large stones, an early predecessor to the walls with uniform rock segments that later demonstrate a better grasp of how to split and shape them consistently.
And pyramids are the same thing. These people were not so stupid that they couldn't figure out the most basic way to build higher structures. In those days that was the only way you could do it. And of course they're going to have a lot of similarities.
But going back to the mathematics as an example, there's a reason we use arabic numerals to this day. And the number system used by the most ancient civilization we know of (Mesopotamia) used the sexagesimal system which is still used for crucial things like angles, time and coordinates.