
Summary:
Papers on 003's hull design started appearing as far back as 2012, but it was further updated to the current version in 2014 and from then papers on the hull design seems to have been mostly finalised with minor mods seen from papers published since then. More importantly the "Sino-Zumwalt" models have seemingly been appearing for around a decade in 32 different papers to date, with multiple physical models appearing. He notes that the design seems to have gone through similar design iterations like 003's design process, suggesting that this is likely a real project that is in its final stages by now. Another interesting thing to note from this, is that he mentions that there doesn't seem to be much mention for a general purpose 9000t destroyer in papers in the recent years other than a "DT5415" model and some papers using the Burke model neither has there been a mention for a physical model for such a ship in any papers. Meaning if there were ever such a design, it was not taken further than computational analysis or preliminary design, atleast not according to current evidence. Possibly meaning that the 9000t general purpose destroyer is no longer a thing or possibly never has been a thing.
Another post:

Summary:
054B's original hull plans was seen as far back as ~2015-2016 and didn't really change ever since. Although it was only built after 8 or so years due to awaiting a suitable diesel engine.
003's current hull design as mentioned above was mostly finalised as far back as 2014 and waited for EMCats and new boilers to be ready before construction started.
Similar to both of the above, the tumblehome design was seen as far as 2014 and was only minorly modified ever since. It is likely that it is awaiting next generation gas turbines and diesel gensets to be ready before construction.
This is from one of the papers showing specs for the hull and a physical subscale model, this is the same 14000t surface combatant mentioned by my previous posts in this thread.

SOYO also mentioned this ship, commenting on the design of the hull. It takes a completely different route from Zumwalt and ONRT designs which has a blunt edge under the waterline connecting to the bulbous bow and a more conventional hull shape below the waterline while the Chinese design uses a deep V shaped hull below the waterline and has a smooth transition from the tumblehome bow to the bulbous bow. Hence, just because it is a tumblehome hull doesn't mean it is a copy of the Zumwalt.
ONRT model:
Zumwalt's hull cross section:
Chinese design:
