Exactly.
That's why I pointed out the evolution of building techniques over the centuries, Maeght.
We don't know exactly which method was used, but we do know the three or four alternative methods. Time and the action of sand had erased traces of the copper which was left by the chisels, I suppose.
Claims of ancient technology, alien technology, lost technology, secret meanings of the measurements of the Giza pyramids, not to mention Hancock's dating the Sphinx to before 10,000 BC, can be lumped into a term coined by the 'father of Egyptology', W.M. Flinders Petrie, when he was approached by one such 'theorist'.
He called them 'pyramidiots' - and the term stuck.
They were, and are, incredible constructions - dubbed 'resurrection machines' by modern Egyptologists.
Don't bother sticking a tomato under a pyramid to see if it will germinate - the 'resurrection' was supposed to unite the king with the solar deities.