Red's parole hearings in The Shawshank Redemption

In The Shawshank Redemption (1994) Red has three parole hearings. For the first two, in 1947 (YouTube link) and in 1957, he tells the parole board what he thinks they want to hear, and is unsuccessful. In his third in 1967 (YouTube link) he takes a different approach, saying, quoting from the IMDB quotes page:

1967 Parole Hearings Man: Ellis Boyd Redding, your files say you've served 40 years of a life sentence. Do you feel you've been rehabilitated?

Red: Rehabilitated? Well, now let me see. You know, I don't have any idea what that means.

1967 Parole Hearings Man: Well, it means that you're ready to rejoin society...

Red: I know what you think it means, sonny. To me it's just a made up word. A politician's word, so young fellas like yourself can wear a suit and a tie, and have a job. What do you really want to know? Am I sorry for what I did?

1967 Parole Hearings Man: Well, are you?

Red: There's not a day goes by I don't feel regret. Not because I'm in here, or because you think I should. I look back on the way I was then: a young, stupid kid who committed that terrible crime. I want to talk to him. I want to try and talk some sense to him, tell him the way things are. But I can't. That kid's long gone and this old man is all that's left. I got to live with that. Rehabilitated? It's just a bullshit word. So you go on and stamp your form, sonny, and stop wasting my time. Because to tell you the truth, I don't give a shit.

Red is then granted parole. Why, after this disparaging and weary speech? Was it because he was being so bluntly honest? Was intimidation a factor?

Answer

I'm not sure if I'd agree with parts of Wbogacz answer. The Humility part specifically. I always got a more resigned vibe from Red.

He doesn't believe that the board will really grant his parole, and as such doesn't see the point in lying to them. He is honesty, sincere and expresses true regret for his actions, rather than trying to convince the board that he's been "Rehabilitated" as he did in the prior attempts.

I don't think there was any intimidation either, if I recall the scene correctly Red was sat in a relaxed pose for the interview, not in a leaning forward threatening manner.