When looking toward Chinese forums and weibo, seems China choose to upgrade those 4 Project 956EM as stop gap until their own Type 52D and 55 numbers are sufficient.
There's argument that the life span still considerable enough, it can be used toward 2030's before being taken out. That at least provide additional 15+ years interim stop gap, from middle last decade. The upgrade shown the potential for the design being strech toward VLS environment standard. 48 VLS is quite good to strech an older design like this.
I do think if Russia has enough industrial capacity to upgrade their own project 956 and pararelly build new ships just like China do, perhaps they are doing it. As such upgrading one Kirov class battle cruiser already take most of their upgrade capacity.