Those 2 clips in the OP don't prove anything. Could be aimbot could be natural aim.
This is coming from the leader of Alpha @ Afterworld, so I have some experience with PvP and I've seen what a really good PKer can do with natural aim.
However,
the video Soko posted about Caperon hunt is really really suspicious. The guy fails all the basic bot checks--which means he's definitely using a hunting bot OR deliberately trying to look like a bot (which is what he claims after being caught). To waste PEDs by shooting at mobs other people are already shooting and losing mob after mob to someone else? Just to try to fool someone? Not a very convincing explanation if u ask me...
There's a software which can tell for certain if the avatar is controlled by software or human being. Sadly you have to have access to the system logs to use it. MA can tell who's who in EU if they want, or even care.