Exactly.
Enhanced techniques work. It is as simple as that.
Depends on how you do it.
If you do it willy-nilly and just ask questions where you fire away on questions you have no clue as to the answer, that is not helpful.
However, throw in questions where you know the answer. . .that is the key.
Interrogate and ask questions where you know the answer and ask questions where you do not know the answer and the prisoner hasn’t a clue if he will be caught in a lie.
This confuses the prisoner because he doesn’t KNOW what you know, and therefore risks being punished even more if he is caught in a lie.
It is keeping the prisoner mentally off-balance, never really knowing what is known or not that makes the technique effective.
If you want to see an effective interrogator, watch the first part of “The Lives of Others.”