TLDR: Basically, there's a CCS adapter hidden in the Supercharger stall. If you want to charge a CCS car, all you do is start the session from your phone. The CCS adapter unlocks, and it's on the end of the cable when you pull it out of the holder.
I didn't notice it at first when I arrived, until I recognized the location from the video. It's really compact.
CCS1 and CCS2 use the same communication protocol and Tesla adopted it for NACS in the North America market because they had to for the European market.
Older NA Tesla's can get a body module upgrade to support their CCS to NACS adapter.
It sounds like the adapter will be used at least initially to restrict which cars can use Superchargers. I would imagine this is partially due to the lack of payment terminals but also to prevent untested configurations of EVs.
The word on the street is that the Tesla plugs will start speaking the CCS protocol so an adapter is trivial.