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No, it’s a numerical coincidence related to the fact that 81 has a geometric relationship to any base 16 square via the Law of Odd Numbers and a square of surface 64 which is 1/4 of a square of base 16. The diagonal relates to the perimeter by 2 x sqrt 2 and when converted to 100/64 becomes 100. This is geomeometrically true for all squares of base 16 and has nothing to do with a pyramid. 100/64 is numerically the Indus to cubit ratio.
None of this has anything to do with intent. The only thing GP and SH May have in common is that the design might have beeen inspired by the periods of the Moon.