Pre-emptive admission? I think so.
Given that he's presumably spilt the USPS beans to Novitzski (who's not interested in anything else, is he?) and is never going to ride professionally again, why not try and scrape back some credibility/reputation with a mea culpa, even if it's 7 years too late and follows another 8 year ban. He has nothing to lose. I haven't seen the 60 Minutues programme, but I guess the confession also gives him a chance to publicize his new job as a cycling trainer (which may also lead to a book).
In my younger and more naive days, the positives which I was most surprised about were Millar's (he's British!) and Hamilton's - personable, clean-cut American, with pretty dog and wife (or the other way round, can't remember), and heroic stage win with broken clavicle. Their behaviours following their respective bannings were very different. Remember the chimera claim? I know which of the two gained my grudging respect and which did not.