It's plain to see that planes matter.It is and most likely has a shaft in the magnet bearing. But still even that kind of bearing is not good IMHO and it doesn't mater who's table it is. When the arm doesn't stay fixed on the same plain as the platter we get issues with skipping. If you use that design with a poured slab platform and a 300 lb table it should work fine. But most real world living spaces are going to have some movement with a light table. They would be far better off putting magnetic isolation or levitation under the whole table where it will help.