We do know how the vast majority of these artifacts were made, though. Most of the people "just asking questions" are ignorant of craftsmanship and historical achievements, whereas the 'academics' are not.
Quartz and diorite are harder than granite. Quartz sand abrasion, hand drills utilizing quartz, diorite smoothing tools and melting with hot coals are all techniques recorded by the Egyptians, and have been reperformed by scientists and engineers with similar results.
UnchartedX is run by absolute whackjobs who believe an ancient super civilization, despite no iron, no lithium, no artifacts indicating use of electricity, milled these hand crafts with computer guided drills. It's even dumber than ancient aliens, because at least aliens could take the evidence of their existence with them.