Ocean is too ample, tell me how the hunter killer sub, P8 & P3 can locate the undersea sub and submersible arsenal that are still 400 km far away from the CBG? IF that is so easy like you said, then US must have been able already to locate all the chinese and russian sub all over the world, which contrary to the fact that US supercariers were stalked by chinese sub (that you said decades away) at least twice undetectedly, and they were known because they appear on the surface nearby the carrier
Other things to ponder:
1) How long for those P8, P3 take to get approach the Type 55 400km away? and how long it takes for mach 2.5 YJ-18 to reach CBG 400km away? which one will reach the target first?
2) Tell me, how P8 and P3 could approach Type 55 safe? considering the type 55 and arsenal ship are loaded with abundant of HHQ-9 (similar to S-300) that can shoot those plane within 300km away.