I just listened to this interview and no Ben did not own up to his misbehavior. The thing is when you say and do dumb crap in the past, you have to be ready to admit it and move on. Instead every response was this arrogant "Even when I say dumb stuff I am still right" kind of mentality. He didn't want to answer the question and instead just became argumentative.
So Ben wrote a book about a problem he himself championed during the years and he couldn't be even a bit humble enough to suggest that maybe how he went about such things was wrong and he has moved on. If anything by watching how he handled himself during the interview, I would say nothing has changed with Ben as he continued to try to defend some of those old quotes even when he knew they were bad.
Not all of them were bad. A lot legit have explanations. That also has to be understood. Sometimes an outrage isn't really an outrage. We are living in a time of internet outrage over half-quotes and it really should be okay to push back against those cases. However, he has owned up to several quotes that he considers wrong and said as much in this interview.
I suspect Shaprio wishes he had this one back, but that doesn't mean that the interview was conducted professionally.