A couple of things.
While never an interrogator, I knew some when I was in the military. Building a rapport, showing respect, gaining trust are classic techniques. In fact, you can see them in fifty year old movies.
Second, anyone who tells you that coercive techniques don't work is full of crap. Whether they are moral is another question, they work. How is this even an argument? Ask the pilots who were interrogated by the North Vietnamese. And their methods were crude. Ours are very, very sophisticated.
If mild discomfort works, so does severe discomfort. No you can't go "fishing" using coercive techniques, how would you know if the guy is just telling you something to escape the pain? You have to pretend not to know things you do know, important things. When you know something he doesn't know you know, and you pretend to want it bad, and it's very important, when he breaks and tells you what you already know, you know you have him. Then you can trust the other stuff he says.
It all works together. Again, I'm not advocating torture at all, just saying that it works when applied correctly.
Also, from what I've heard about this guy, he was a minor player, not as involved as he pretends, and acts like he knows way more than he does. He pretends like gaining trust and rapport is some new thing he invented. Yeah, okay.