The fact that these subs were even detected isn't good news to the subs. That's assuming the story is true.Reportedly, PLAN discovered alot of USN submarines around Southwest of Taiwan. Between Taiwan and Dongsha island, guarding the strait transits to Pacific ocean.
I think this will be US strongest interfering force. I mean DF26, DF21, DF17 will deter carriers and China antiship missiles will deter surface fleet.
This is the least talk about but USN submarine will be the main force to interfere China and taiwan situation