The internal ramp theory answered many of the questions asked by sceptics about the external ramp theory or the Ancient Alien theory.
While we are discussing alaternatives to the traditional theories, why not go all the way and bring forward the theory that the pyramids aren’t made up completely of cut blocks of stone but might be filled on the inside with sand or rubble from the quarries of the cut and dressed outer shell. Makes sense to me because of the time needed to cut and dress stone plus the effort needed to move millions of stones weighing up to 2 tons.
Oh, I'm still on board with Davidovits' geopolymer model (oddly enough, also French), and of course it has the virtue of being 100% compatible with internal ramps, ladders, shadoufs, prehistoric helicopters, or any other ideas put forth to date regarding techniques used. :^) One of the problems all of the quarried stones models has is the massive need for quarried stones early on. There's the water floatation hypothesis that is particularly impacted by this (not to mention that it is inherently untenable). By the time the halfway point in height is reached, about 89% of the mass has been installed, thus the second half takes about 3 years to complete, that's when the internal ramp would really take off, and poured synthetic stones would really make the work fly, particularly near the top when there's no way to deliver blocks through any kind of ramp. I suspect the use of scaffolding is part of Jean-Pierre Houdin's model, but if so I'm not aware of it. It would also mean the ramp exit must be fairly easy to find near the summit.
Conference: building the pyramids of Egypt with artificial stones
https://www.youtube.com/watch?v=k0nOw_ebmGk