In recent years, Bohai shipyard built 2 brand new assembly buildings for submarines. That implies annual production capacity of 16 SSNs or 4 SSBN/SSGN-sized submarines (or any combination thereof).
Yet Bohai decided to build a second submarine assembly building, with roughly two-thirds of the capacity of the first building.
If we take those 2 buildings together, there is space for 20 SSNs to be assembled simultaneously, which works out as 26.6 per year. At that rate, then every 2 years, the Chinese Navy would be adding the equivalent of the entire US Navy SSN fleet.
So go think about how US going to win a war with China