I don't see him in Memberlist, but maybe I'm just too stupid to check.
You're registered on forums, yes... But it doesn't mean you're a member of the clan.
I sent this email to one of the admins:
"Hiya,
I'm DeviL a known player from FSK405 Superman-Server & (known) in german community of UrT.
Today on our server a player connected:
Player: Fail[1Up]
IP: 91.104.132.158
I guess it's an impersonator, I haven't seen him in list of members & he didn't know what Teamspeak/Mumble is, or what the !alias function does. Some of my clanmember thought he was hacking but he went afk when I joined spec.
Just check if it's one of yours."
So, you know what happened.