The video that you are seeing here is Rich Lee, and he just had magnets implanted in his ears. The purpose is to create headphones that are essentially surgically implanted.
Yes, the magnets work as speakers, but they require a coil necklace with an attached amplifier that hangs around the neck. Controlling the volume is apparently done by moving the coil and amplifier closer to his ears.
I consider what Rich Lee has done not to be unusual. Have you ever heard of people picking up radio signals off dental work? I know I have, but I am certain that those who want to change the channel.
Why not have headphones in your head? I suppose you could use bone conduction, and I talked about that in my last article. Personally, I think this is the future, even though it sort of creates “Borg-like” possibilities. Then again, isn’t Google Glass ready to rock the world? Why not have something that you can put on?