It's a script, See attachment.
You cant.
g_punishRecon
default: 0
desc: If set, players will be unable to get out of punishment by reconnecting.
0 = No player data is saved through a reconnect
1 = Punishments are remembered and reapplied after a reconnect
2 = Both punishments and player score/stats are remembered and
reapplied after a reconnect
You cant mute/dummy for ever, If they guy is that annoying just local ban him from your server.
demo.zip