They did not come to that conclusion???? The vids, (posted later by you or me) do not in this case, actually promote artificial. In fact, OPPOSITE, it is strenuously denied? (incorrectly Imho)
Evidence Suggests Incas Could Dissolve & Reconstitute Limestone
Astonishingly, their analysis also revealed that the blocks were made of limestone that, at some point, had been dissolved and reconstituted during the course of construction. Geologist N. Berdnikov (PhD, Deputy Director of Institute of Tectonics & Geophysics, Khabarovsk, Russia)
As I said, "Why bother?"