Nice video, but show me a string loop going around the platform or someone disturbing or lifting it off the base. Or maybe the startup sequence when device is powered on and we are supposed to see the platform rise up and then the pins retract and it hovers. I'm still not convinced given the facts thus far... but if true, I will be the first to congratulate them, for making something look awesome but otherwise completely unnecessary (sorry, I grew up on LP's, cassettes, CD's, but have never looked back since my music was put on digital memory).
By the way, I found this on YouTube which seems to be trying to accomplish a similar task, although much simpler and purely passive with no need for power: