We're still in the period of hype where naysayers are put on the shelf in order to push the narrative. Remember solar panel roads?
My money says they have a thin layer of magnet coating a material creating the illusion of the messneir effect. A parlor trick with a very long crafting time. People want it to be true, and there will be conspiracy circles about the government locking down the research.
I hope I'm wrong. But I'm not driving on any solar roads.