Personally, from what Denver has posted, I think he needs that too. he's mentioned numerous times trying to change his wife's view on this.
The problem here is that his W won't concede that - ever. I do think it would be healthy for his W to see things from his side (while technically not admitting to it) One of the greatest strengths in communication is seeing your other side's point...even if you 100% disagree with it.
One other way you can look at is, is how define "saying" your "I'm sorry."
I think I have heard the words "I'm sorry" cross my wife's lips MAYBE five times in the 27 years we've been married. However, her primary LL is AOS, and she often "says" I'm sorry in the form of one of my favorite meals.
I think there are other ways that Denver's wife might be able to demonstrate remorse to him, over time, in a way that fits her stubborn ways. It will be up to Denver to determine whether or not those ways make him feel loved, and safe once again in the marriage.
