I called Brian Cox a moron, nobody else.

The results of Foucault Pendulums around the world are consistent with all the calculations made on the very well known rotation of the Earth.

"...Otherwise it would solely be used as definitive exclusive proof". It is used as definitive proof.

The experiment, well done, does not ignore precession or magnetism

If it is "pretty damn weak" then disprove it. Do the experiment and confirm that the planet does not rotate as expected. Do it. You can do it, anyone can do it, unless you live in the Equator. What are you afraid of? Do it.