I've got a better explanation, other than flat earth, upon watching the video up to 3:58

The aether responds to a vortex, because it is heavily attracted towards cones and conic shapes which geometrically represent the consequence of a vortex, namely: the centripetal forces at work within a vortex helping to shape a cone into existence out of the energy imbued within a physical object which is spinning, such as a gyroscope.

The aether engages physical space when physical space rotates, as in: a tornado, or a hurricane, or a magnetic field (which also has its own spinning field). Once engaged, your experiment validates, not a flat earth, but a gyroscopic action locking itself into the aether as its reference -- kind of like a ship at port "weighs anchor" by dropping a heavy mass overboard. Thus, the aether, lends to the physical, inertia whenever the physical is set into a force of centripetal motion.

Now, why would it be necessary to suppose this? To: A) Validate the geocentrists who claim that the earth is round and set into rotation of its own around the sun, and B) Validate the flat earth point of view in which the aether, not the earth, is the source of flatness making the aether serve as a field of reference for everything within itself.

In other words, the Earth is round, but the Aether is flat.