How do you do that when pouring a soft rock slurry? Small perfectly round (extruded?) metallic tubing perfectly spaced and held in place by ??? ...and then there is forming the groove in which the holes begin. You are possibly a stone mason; I am just a skeptic.
***Using molds to form those Pumapunku structures was feasible***
Again, enlighten this poor initiate how to build a mold for those 'H' blocks with virtually glass smooth surfaces; could you do that with hand hewn wood? What would I make the molds from?
My point is not to argue but to raise legitimate questions - legitimate to my untrained mind. You don't have to respond. I think Davidovits makes a compelling case for his 'geopolymer', but he still raises questions - which perhaps he could answer. It is beyond my ken. Or perhaps some of the engineering was performed much later.
Metallic tubing? No need for it. Wood molds, a round log for the holes, finished surface via hand polishing.