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You can't understand because you are brainwashed with the pi concept and are unable to think beyond pi. You think because you find an inherent value like pi in some circle it was recognizable to everyone who came before therefore they should have knowledge of that value! Actually, whether aware of it or not, you are just projecting your own pi brainwashing on the ancestors who came before.
Fact: Since pi occurs naturally in any circle that you found pi in their circles is not proof they were aware or used pi. Neither is it what you are anyone else believes, but what you can prove. Thus far you have failed to produce anything showing they were even aware of pi!