Google is an enormous company which operates flatter than you’d expect for an organization of its size. It’s entirely possible that someone from Google was involved in organizing this (i.e. booking the venue) without having buy-in from leadership. Once leadership became aware after being asked about it, they may have shut the whole thing down because they knew the optics would be bad.
Calculus was invented in the late 1600s, almost 2000 years after the Roman aqueducts were built. The Roman engineer would know some geometry, but certainly not calculus.