yes yes. They are known cheaters. Also on the follow list. Anybody should get a "suspected of cheating by zietsh" warning when they connect.
But don't ban them please. Just slap him (until he leaves). (Or !k if he really badly misbehaves)
Or name yourself "zietsh" and he will leave as soon as he sees you on the server
(as i always !kill or !slap him
)
Btw. demos are always cool but no need for this guy (already enough in the forum) until he explains/defends himself in the forum the reason of ban evasion should be good enough.