The USADA isn't a court of law. He hasn't been criminally or civilly prosecuted yet as far as I know. I don't think the evidence requirements to ban someone from sports are at quite the same level as a criminal court.
I understand that sports can and should ban people for less than conclusive evidence, but the USADA has been portraying these witness statements as conclusive and undeniable proof he doped.
Did he dope, I have no idea. I certainly think it's in the realm of possibility but I don't know. We can see what he says when he does the Oprah thing. I also can't seem to find any source for the "leak" that he is going to confess, it seems to be the media speculation feeding upon itself.
Looking at all the lawsuits filed against him with the expectation of him confessing makes me wonder why he would admit to doping.
Going with the assumption that he did dope and is a media savvy egomaniac as portrayed by his detractors.
Step 1: Set up Oprah Interview.
Step 2: Have close friend "leak" news he will confess to build up interest.
Step 3: Deny everything and make counter accusations.
Step 4: Release book amid controversy detailing his "struggles" and persecution.
Step 5: Buy Tropical Island and Livestrong?
It could be all fantasy but It would certainly have that polarization that makes for good book sales lol. Maybe he can take a page from the OJ Simpson playbook and write in in the "If I Did It" style.