When I stopped at a certain* Supercharger a few months ago, a Tesla engineer was on-site. We got to talking and he showed me the equipment behind the fenced-in area, particularly the cellular data transceivers—multiple ones. Then he mentioned something about wifi coming to this site so people charging could watch movies etc. Nothing’s happened since but I suspect it’s related to this recent Elon tidbit.
*not gonna say which location; don’t wanna get engineer in trouble