I'm supporting Kalphiter here. He had no intentions on spamming the chat, because of your faulty mods. He tried to connect to be able to join the server, but in retrospect got banned. I don't find this a bannable reason because of a few things
1) It wasn't his intentions on spamming the chat. He wanted to join as it seems and the mod kicked him out, it was a bug.
I've noticed this with DrenDrans stupid CityRPG mod or some sorts which would kick players for not having a certain mod, eventually I was unable to delete the mod and it popped up everywhere.
2) This was a non-competition ban, which would be like the same as banning someone for being black, or because they have a bad reputation on Blockland. If you want Blockoworld to be successful in the eyes of people, then don't ban someone because of a cause they tried not to bring forth into the server.
3) He found a bug in your add-on, and what do you do to give him thanks? Ban him. Think if he haven't of stumbled upon it, Blockoworld could have opened for the public and half would have no way of getting on because of this faulty error, which he gave spotlight, which hopefully gave you the intentions on fixing it for a better survice in the future.
So, Kalphiter IS innocent. Yes, it wasn't the best idea to clusterforget the chat, but he couldn't help it and his intentions was wanting to get on the server.