Agreed. If the "floating" (I know its not actually floating in the traditional sense) object could carry its own light-weight cooling system then you wouldn't need to chill the entire unit to super cold temperatures. You might only need to cool the superconducting layer.

Loads of up to 500 grams on this test rig, on what look to be about n40 magnets, according to the presenter's comment on one of the lab videos. The liquid nitrogen is a problem but that payload seems like something that could already have industrial applications.

from the comments

In the lab we succeeded in putting up to 0.5Kg on top of one disc. Keep in mind that the thickness of the superconducting layer is ~1micron ! Its a strong effect.