Even with wheels, it will be nearly impossible; the terrain is all sand and uneven. There is definitely something we don't know.

While it was truly a marvel of technology at the time. It's not an unachievable task. One major discovery helps illuminate the whole situation and that is, that the Nile had deltas very close to the pyramids back then. (a couple kms iirc)

Also while they may not have stone wheels, they certainly did know that you can shove logs under the stone and move it on the logs, which kinda serve like wheels, just not attached to the moving object.