Untrue, China has only 5 more 052Ds and 6 055s left to commission with no further launch. There is no guarantee that PLAN will continue mass orders and given that PLAN will likely be going through a large technological overhaul this 5YP, alot of new types will be introduced which will limit production rate.
Granted, the Type-052D could do with updated version.
But the Type-055 design is new, so I don't see why the design needs a "large technological overhaul".
And when you refer about new types being introduced, I presume you're talking about the 6 new aircraft carriers to be built by 2035, as per Pentagon reporting to Congress? Such an aircraft carrier construction programme would benefit from reduced Destroyer production to free up shipyard capacity at Dalian and Jiangnan.
---
And looking at the notional fleet structure in 2035 that require Destroyers as escorts, there should already be enough destroyers today.