Yes the same American p8 doesn't carry mad. As long as submarine is submerged p8 will have a hard time detecting it. And Pakistan submarines can easily travel to Indian shores without surfacing even once
US has a different doctrine when it comes to SUB, and P8 has sensors to detect submarines , it's just India Wanted a MAD sensor as well to be Doubly Sure that no porkie subs get through.
US is changing the doctrine when it comes hunting a sub , they are going for a longer range high altitude sensors which cover more area but have less sensitivity and less specificity in detecting subs , whereas MAD requires low altitude relatively , which reduces the range and puts stress on airframe and less coverage area , the difference is in doctrine and how all the complex sensors are involved in detection.
Indian P8i has both the sensors and can make use of both of them to accurately detect and confirm the hostile sub.
It's going to work like this P8I deploying Radar and other sensors detects a hostile subs at some location and then drops down in altitude and does a second pass with MAD engaged to confirm the submarine signature to issue the kill chain or vector in a Dornier or other Naval Asset to take a look.
you can try sending a sub and see how far they get to Indian shore , i can understand destruction of karachi harbour still haunts your kind till this day , its okay to be scared don't worry.