Forgetting whatever that person is talking about....
What you are saying is also not true.
True, the networking/engine team would be working on the core functionality of server meshing. But CIG is implementing SC in the most inefficient way possible.
The core team is working on server meshing, but then every other team has to implement the solution/libraries/interfaces/apis (whatever you want to call it) in all the other parts of the game that already exist.
This has happened before. The devs have talked about it and it is reflected on their roadmap.