I would say, "The technology is 'great', but the theory (explanation) is not up to the mark".
In my opinion (based on my theory), it is the balance of forces that causes the phenomenon. In the three dimensional space, a minimum of three independent forces are required for the distance to remain static. Here, the gravity, the electromagnetic repulsion and the kinetic energy of the electrons (a repulsive pseudo force) remain balanced at that given distance. Because of the superconductivity, the electrons could acquire the required speed. The shape of the wafer-thin object helps to create the required motion of the electrons, while keeping its mass the minimum. Hence it is technologically great.
A technological development is possible even without fully knowing the the theory behind it. This has happened many times in the past, and this is one such case.
