That supercharger has been there for quite a while. I remember seeing it there during the early drone over-flights. Perhaps the cables are below the gravel, but I am quite sure it is functional. From what I understand is this supercharger is for Tesla executives and employees, therefore not available to the public and problably never will be. But I am sure Tesla will build a fully functional supercharger site available to the public at the gigafactory site. Wouldn't be surprised if they also have a parking lot of standard L2 HPWCs around too.