Bhai, young generation, you have to keep the context in mind. Unlike us, he is not a Pak def enthusiast. He was given a video to analyse in isolation, he did precisely that, he identified the sub and named possible countries to which such a sub can belong.This genius thinks 6hat a Chilean submarine will be loitering in Pakistans coastal waters.
Whare do they get such "Military experts " from?
Thora sa kaam hamein bhi karna hai, we had to put 2 and 2 together to reach the conclusion it was an Indian sub.