Wouldn't a regular fleck of magnetic metal do this too? I've seen many examples where metal dust arranges itself into lines along the magnetic field lines like this video is showing
I'm absolutely not an expert on any of this so I'm probably missing something
A piece of magnetized iron would flip the other way if you turned over the magnet. That's why in the Chinese videos you see them remove the magnet, flip it over, and put it back under the sample.
The same "end" of LK99 floats, no matter which pole of the magnet you put toward the sample.
I'm absolutely not an expert on any of this so I'm probably missing something