EV charging is changing, but much remains to be settled. A flurry of news over less than a year permanently altered the US landscape for EV charging. Now comes the hard work of making it all happen.
chargedevs.com
Tesla switched from CANbus to PLC in 2021 according to the link (and others found easily via Google).
Well they are all wrong, or you are misinterpreting what they are saying.
Tesla never switched. They did publish the NACS standard, that uses, CCS, but they still use the Tesla protocol themselves, even in Europe where the Model 3 shipped with CCS support in addition to the Tesla proprietary protocol. (And likely will continue to do so forever. Partially because if they want to change something on it they can at anytime, but now that NACS is an official standard, SAE J3400, they can't change anything about it without getting the SAE committee to approve the change.)
Again, pre-2021 North American vehicles can't talk CCS, or NACS/J3400, without a hardware retrofit. So, if they switched to CCS all of those cars would not be able to Supercharge. (The same applies to pre-2022, I think, Model S&X vehicles in Europe.)
And then there are the V2 Superchargers that generally don't support CCS at all, so if the vehicle only talked CCS it wouldn't be able to use V2 Superchargers. (They did add CCS support to
some V2s in Europe, but from what we have seen there are no plans to do that in North America.)