Banned, dont know why?

Hi my friend got banned 05-05-2015 while trying to optimize his graphic in game.
https://forum.nostalrius.org/viewtopic.php?f=32&t=1100
He dont know why he is banned, and can't create an account on this forum, which is why I write.
His account TullerNuller
He has a level 30 gnome mage
and a rouge around level 6-7ish
Can you help
Regards
Warrstalker
https://forum.nostalrius.org/viewtopic.php?f=32&t=1100
He dont know why he is banned, and can't create an account on this forum, which is why I write.
His account TullerNuller
He has a level 30 gnome mage
and a rouge around level 6-7ish
Can you help
Regards
Warrstalker