It's a login prompt and you can close it to keep watching. But as linked in another comment, this link may be easier for non-Chinese viewers: https://targum.video/v/2023/8/1/e2ad3b8e86961ccfdcf411d2d4d1...

Thanks for that. I feel this video isn't particularly good after watching it. Surely that could be any ferrous material thats interacting with the field/inductive eddies there.

It isn't physically possible for a ferrous material to levitate above a magnet like that, when the magnetic poles are reversed. Basically you could structure it in such a way to generate a ferrous material levitating above a magnetic north pole, but flip the magnet around and you won't see the levitation. They flip the magnet around in this video.