I would argue that hauling a block up there isnt' any harder than hauling that much concrete up there. I think this is all quackery and only morons would buy it.
Actually, the more I think about it, I think hauling the block would be easier.
You are probably correct. I imagine they pondered this thought. Now, when we speak of now, it is interesting, but why does it matter? It really is not that anyone any more has learned from past mistakes or from past successes! Heh heh
Here's a thought for you ~ it was undoubtedly mud, and the mold had a large block of limestone in it.
The limestone would "float" on the mud and thereby be lifted to a higher elevation.
The Egyptians would not have had to have thought much about the matter to adapt the hydraulics they saw in front of them every day to the moving of stone. They invented trigonometry without having to go through the tedium of first inventing algebra and geometry.