In real life, you'd fill wagons up with loose stone broken away from the quarry area, haul same in wagons pulled by oxen or elephants to the pyramid build site, pour same into formers as the video shows, add some sort of bonding liquid, and presto, on to the next block. Ever wonder how those blocks fit as tightly as they do? Pouring them would do that....
That is the most convincing part.
You could maybe make that claim for the 2 1/2 ton limestone blocks, but what about the 25 - 80 ton granite blocks above the King's chamber that were transported from Aswan, 500 miles away? The Egyptians were also cutting and transporting 100 - 450 ton, 70 ft. long granite obelisks with regularity. The little limestone blocks may have been the least of the challenges they faced when building the pyramids.