A thinking flea on a hot air balloon would realise that the differences in direction (clockwise/counterclockwise) encountered when conducting Foucault's pendulum experiments invalidate the claim that the experiment by any means can prove or disprove the rotation of the balloon.
your reply indicates you do not understand the physics.
focaults pendulums only rotate in one direction depending on the hemisphere the pendulum is in motion on, and does not rotate at all on the equator.
by these facts both rotation and closed topology are proven. the pendulum would not precess if the earth wasn't rotating, and would not flip rotational direction based on position on earth if the topology of the earth were open. furthermore because the precession changes linearly with distance from the equator, uniform curvature of the topology is proven.
the observation of the pendulum completely invalidates infinite plane earth.