What's IIRC?
Apparently there's an entire topic on Erastosthenes:
Curvature Measured in 200BC.
https://www.theflatearthsociety.org/forum/index.php?topic=76513.0
I love non-political conspiracy theories and contrarian ideas, but not when easily dispelled with math and logic. The only evidence cited is usually bible verses or optical illusions
