Well, I dont know what is happening behind the scenes in this transition phase, but in general the idea is like this:
The center-of-room-console and the "soundbar" codec are simply two totally different units running both Android and each connecting indvidually to the Teams cloud without even knowing from each other.
The only thing "linking" them together is the fact, that they are both logged in with the same credentials.
That being said plus the fact, that the official roadmap item for center-of-room-console support is ticked off just now, only God and Poly really know, what and how they have done it until now. I have to assume that until this very firmware the console was somehow directly attached to the codec, which smells like a hack.
Anyhow, from now onwards everything should be clear including MSFT's official blessing for such setups.
Great news for the platform in general btw. LIKE!