He’s using it though.
I can imagine having a tutorial on how to hold and move your hands floating in space right next to the grip could be pretty nice for beginners. Or just make the boring exercise more interesting by watching some form of entertainment.
The info graphic suggests that they use the different cooling rate of the first and second layer to lock in the applied magnetic field of heat assisted magnetic recording.
They beat both layers
They apply a magnetic field to save a “1” bit
Both layers are magnetized to a “1” bit
The first layer cools down and locks that bit into place permanently.
They apply the magnetic field to save a “0” bit
While the second layer is still hot and accepts the “0” orientation of the magnetic field, the first layer is already too cold and will not change its magnetization.
The second layer cools down and locks that bit into place.
Neat!