What I don't get is why it would have been any easier to haul wet cement up the pyramid. How are they supposed to have done that?
You wouldn't have to take a huge amount of cement in one shot. A bunch of people with baskets of the stuff could use their loads to fill one mold.
The original problem was how they cut the blocks so they fit so tightly. The concrete would supposedly take care of that, but maybe too well.
I suppose the mix and pour could have been done at the apex as they went and the sand and cement could have been transported by back via 11 million laborers.
Analogously, there's a gold mine in Brazil that is now a big pit mine, but started as a small mountain. The transformation was accomplished one 40 pound bag of earth at a time, up and down ordinary ladders.
You could carry it up in 30 lb baskets. It would be rather quick to construct.
I think they are right.