I don't think this dramatically changes anything. As indicated in this thread, those who already believed he cheated will feel vindicated and those who don't believe he cheated will question the evidence or the process. I think it's probable he cheated, but it's certainly possible that he came back from surviving cancer motivated to win (actually, even if he did cheat, he still came back from cancer motivated to win. I suspect there were plenty of cheaters in this time period who didn't have cancer and failed to win). So it probably doesn't say much.
I'm curious how the taking away titles thing works. If you look in a Sports Alminac under Tour de France, does it list the winner as blank or does it list Armstrong and indicate that he was later stripped?