Ukraine has already demonstrated that relatively inexpensive submarine drones can sink the ships of a superpower. I’m quite sure that the US and Tiawan have noticed this. A fleet of proper underwater drones and additional anti-aircraft missiles could seriously blunt the landings of major Chinese military forces on Tiawan. I would suspect that these are being designed and at least tested already.
China may be able to land troops, but supplying over 100 miles is very difficult esp when many of your ships are sunk
Allies had issues with supplies just crossing the channel