CCMI is also a separate protocol. The level of compatibility with RCS as a protocol remains to be seen, but from the press release and subsequent interview, the CCMI implementation will not be compatible with existing RCS apps such as Google's Messages.
I don't think it implies that but it could extend what RCS means. In either case, if it's not standardized it's not a standard. Google likes to pull bullshit like this in the web space where they call something a "standard" when they are the only one with an implementation and hope they can rally the troops so others fall in line with their implementation. The whole thing is just disgusting politics. Google wants to push RCS to counter iMessage and they want their app to win so they can collect that sweet SMS data, carriers want RCS to break Apple's hold and so they can get that sweet SMS data, Apple doesn't want RCS because then it weakens their stranglehold on iOS messaging which creates brand loyalty (fucking colored dots) and also allows them to give themselves exclusive access to messages for things like Siri and Apple Watch. Basically RCS is a good idea but everyone sucks.