Trying to definitively confirm the precise number of nuclear submarine hulls is nigh impossible.
Not trying to put a damper on the discussion, but I think at best what we can say with a straight face is to give a range in terms of the number of hulls that may exist.
That said, we do have good reason to believe that assembly of at least one submarine has been underway in the new large assembly hall since 2020. But beyond that, trying to guess how many they may have now, and trying to guess how many nuclear submarines they have in total, or by class/type, is very difficult if not impossible.
Just been looking at the literature again, and my best guess is that the latest Type-093B submarines are 110db at most.
That compares with the Improved Akula (110dB) and the Improved Los Angeles (105-110dB).
And the fact that the US has described the latest submarines as the Type-093B denotes that it still has the same powerplant and propulsion train (for acoustic signature purposes)
So we can reasonably conclude that the upcoming Type-095 SSN design will be comparable to the Virginia or Yasen (90-95dB)
And we've already seen 2 new huge assembly halls completed at Huludao, almost certainly with the Type-095 in mind.
It's been 19 years since the first Type-093 SSN was produced, so a successor class is overdue.
There was also a 18 year gap between the first Los Angeles and the subsequent Seawolf that was laid down in the shipyard.
The Russians also originally planned to have a 14 year gap from the first Akula to the Yasen.