From News Coulomb.

This is a clip from a recent live stream with Steve @plugandplayEV . You can view the entire stream here: https://www.youtube.com/watch?v=LgXrpWXTQzE&t=34s

In this clip, we are discussing the term "NACS," which is confusing consumers because two different things are happening related to this new standard. The first is that some automakers are negotiating with Tesla for Supercharger access. That access doesn’t actually require the J3400 plug because Tesla can grant access through their app using only a Tesla plug to CCS1 adapter, as they currently do with "Magic Dock."

The second issue is that all CCS and SAE communications and protocols are moving to the Tesla plug (J3400) format. This means 100% interoperability between CCS1/J3400 EVs and CCS1/J3400 chargers. However, about 8,000 North American Supercharger stalls predate Tesla’s transition to CCS protocols, so those will not be open to non-Tesla EVs. Further, and maybe more importantly, Tesla EV owners will not be able to use public J3400 DCFC unless they have received the Power Line Communications module that allows them to use the Tesla CCS1 adapter.