By this logic it means they are discontinuing old 054A for military purpose? Or are they still building both concurrently.
Purely from a random guess, I'd say it's diversion of Military 054A contact to CCG. That way they can use the long lead items that were already procured/built by the time the decision to switch to 054B came.
For the subsystems like CIWS and VLS, 054B seems to share them with 054A. What we don't know is whether it is intentional from the start (especially with the VLS), or it's a last minute change to accomodate the subsystems that were already purchased for 054A contract.
As for 054A design, I'd guess they've discontinued making it for military, but the basic design can still be used for CCG and export. And if the need came for more military 054A, they could always bring out the old blueprints.