My guess is that this guy is right about the rubbish (stone debris, etc.) fill. To the best of my knowledge, no one has ever gone tearing into the pyramids to see what's behind the first layer or two of stone, so it can't be proved that it's all stone block construction. That's just an assumption made by people who don't build things.
It makes sense that the Egyptians would build the structure in slices; lay down a course of stone for the perimeter and internal structures, fill with rubbish, add to the ramp, and repeat. As they went up, the ramp would continue up. Once they finished, they would start the outer finish and tear the ramp back down. If they used the rockers to turn the stones into rollable cylinders, the ramp wouldn't have been all that long. Or, it could have wrapped around the structure. In either case, there would be little evidence for its existence once the site was cleaned up.
The rolling idea is interesting, however, it wouldn’t help the construction bottlenecks, in fact, might make them worse.
I was sure there was an FR topic about it, found nothin’, may try again, but in the meantime, here’s an image search to help those who don’t know what we’re talking about. :’)
https://www.google.com/search?q=rolling+pyramid+blocks&espv=210&es_sm=93&tbm=isch
Didn't the ancient grave-robbers who looted the pyramids do exactly that?