Matty,
This is seriously fucked up! You realise that the HK Police monitor these forums so even if admin doesn't report this thread to them, they might come across this themselves anyway. If requested, your registered email, the IP address when you registered and any other IP addresses you used to access this site and the dates will all need to be released to them. So it's a good job that you've reported this to them already.
Hope they catch this maniac...