"Self-flagellation is exactly what it is, that was a good call. What they think they're getting out of it, I don't know. The Shat's always been somewhat self-depreciating in his humour, though. I'm sure this "Apology" Device is multi-functional, however. If the movie's currently out, or being released/re-issued for home-viewer consumption, then such platitudes may be argued to help sales, possibly. Even in the sense of just having a new angle to bring the film up again, to keep it in the headlines.
Apologising for it, even years later, might also serve to make whatever auteur appear to be more "Human" ... more approachable and accessible. This might work to their advantage in the sense of simply having something "new" to say on it, as well. I have a hard time remembering what I had for breakfast 2 and a half weeks ago, much less all of this detailed information on a project I was working on, years ago. I guess an "apology" makes for a better interview than responding with, "wow ... you know what? It's been so long, I really don't remember anything about that." But I do wish that they'd let the apology angle go, there are very few who could pull that shit and make it sound sincere, anyway.