I can detect no signs of an aimbot in these demos, at 100%/50%/2.5% speeds. There are copious amounts of over-correction; from my impression the aiming is entirely human. There is one lucky headshot in each demo. In the first demo, with the AK down the short hall between long hall and hostage room. In the second demo, with the deagle down the long hall. Neither of these shots appear to be more than luck.
The fact that he was using a deagle / ak the entire duration of the demo also contributes to my doubts - those guns are headshot machines.
As for locking on to bodies, see my note about over-correction. He knows how to manage recoil, but he can't track a target any better than anyone else I've seen.
There was no sign of locking on to targets behind walls.
From these demos, I'd say no hacks.
Edit:
Permabans are always reviewed, by whoever feels like reviewing it at any given time. If nothing else, I imagine ZERO or a clan member (as they are the only ones who may unban except the banning admin) would review permabans if no one else had done so. By the same token, if multiple admins have already reviewed the demos, especially older, reputable admins, they would probably not bother unless the banned person pestered them.
That said, it is generally preferred to not take chances of harboring hackers - it is a choice between not banning and potentially allowing hacking to continue, OR to ban and possibly inconvenience a legitimate player. Since this section exists, and legitimate players may plead their case (and other admins may review demos), it is usually preferred to not chance allowing hacking.