I don't understand Armstrong's motivation for this. If you are not going to come out and be completely ashamed of what you did, then why open yourself to all these potential lawsuits and public scorn?
In that interview he seemed to still be proud of his accomplishments, because in his mind he was still competing on a 'level' playing field. Not only did he beat his opponents, he beat the tests also. Even his dickish behavior to friends, teammates and the media was excused as being 'carryover' from his fight with cancer. His amazing determination just didn't have an 'off switch' ... it wasn't his fault.
So he didn't come off as contrite at all and just further exposes that the guy behind the facade is a pretty unlikable fellow at his core.