Stupid idea. Actually looks more like a way to steal money from people.
1/ a magnetic force able to turn the platter and making it levitating will also induce vibrations. Moreover, there is no physical spindle which will cause uncontrolled oscillation of the platter because of the cart force and weight and because the center of rotation will be undefined.
2/ the coupling with the arm is a non sense.
3/ a levitating tt with an axis spindle but lowering the friction and the force on the spindle already exists. It is the Verdier Platine, the Verdier Nouvelle Platine, and the Verdier Magnum. Invest in one if you want a TT with the minimum vibrations possible on earth instead of loosing your money in a project which surely looks as a robbery.