@weig2000 bro I know ,I think from my perspective it is software that is needed now with the design of type 9V frozen and due for production any help (design and silencing tech) coming from the Russia is for future iteration improvement.
My only concern is that it may delay the mass production of type 9V, as the Chinese study and learn what the Russian provide(the type 52C sample instead of the 52D). Instead of having them in 2025 (crucial year) in significant numbers, we will have to wait until 2030 that is a long gestation time.
I was saying software would be a big issue ultimately, similar to the EWS, which has a similar software/data issue and is the main one.
But in terms of nuclear submarines, hardware is the main issue before you start to operate it, after which software starts to dominate. There are a bunch of key challenges such as reactor, hull construction, noise reduction etc. If you trace some of the official or semi-official reports/documents/news over the years, you get the sense that they have made progress across the board in all areas or key subsystems. I suppose 2025 is some milestone date, but it's difficult to know the exact details or dates, particularly now with the crackdown on any defense information disclosure/discussion.