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Experts are divided on what color skin the Incas had, but we know they invented geopolymers that poured like concrete.
(lemmy.world)
Edit: Cropped the image. The last person said a few crazy things but overall they were making a good point, so I thought better of including it.
You sound like you have knowledge and experience. However, have you considered getting on Facebook and just saying something silly but with confidence?
8 foot giants with their teeny tiny bags of concrete
“Alleged” 8 foot giants.
Why would they even need 8 feet? Were they an alien race of spider people perhaps? I think yes they were. I'm off to Facebook now to tell the masses.