When the magnet is moved below the flake, the flake stands up, meaning it is being repelled. This is the case for every magnetic material, but what they do in the video is flipping the magnet around so that poles are reversed, a normal magnet would be attracted = flake flat on the surface but instead it is also standing up. This shows that the material is a diamagnet at least = it always creates an inverted magnetic field to the magnet.

So here's why this could be big: Not all diamagnets are SC but all SC materials are diamagnets.

It’s not simply moving it’s levitating due to repulsion.

https://en.m.wikipedia.org/wiki/Meissner_effect

In "normal" magnetism, opposites attract and similars repel. To get a metal to repel a magnetic field it needs to have a magnetic charge induced on it. That charge will repel only one of the magnetic poles.

In this situation, this flake repels all magnetism - regardless of pole.