I actually believe AJ said he will never fight him. I could be wrong, but I seem to remember a great deal of bitterness over the PEDs use and the cancelled fight...which makes sense given what came in its wake.
Honestly I think it'd go to points. Miller isn't great as a boxer but his whiskers seem pretty solid.
Anthony would beat him now probably. But in hindsight the fat slob may well have won back in the day considering Ruiz did and Ruiz is smaller and has less power. Anthony was overconfident at the time and it would have been the same with the fatter slob. Anthony looks completely natural and PED-free and so it's natural he'd be outraged by cheaters in the sport. This is a sport where you can actually die in the ring, so he won't stand for that kind of thing.