Seems Blake is overly tired he didn't add the channel in the kick command. Easy mistake, easily fixed:

Code:
on @*:JOIN:*: {
  if (Anon* iswm $nick) { 
    .notice $nick Please change your nick within 2 minutes, or you will be kicked.
    .timernick 1 120 kick $chan $nick Please change your nick
  }
}