If it isn't listed on the official fansites page then it isn't an official fansite. Simple as that. (
http://www.habbo.com/groups/officialfansites) Those that got banned for saying stuff like that probably was banned for something they had done earlier, I don't know and I don't care. If even it is a silly reason, appeal it, it does you no good to fight back with the moderators, and won't help you get your account back.
They've had years of notification, everyone knew before hand that advertising isn't allowed on .com. It says on .com no advertising, is all I know.
Also, HabboTimes: 15. Juni 2010 ~ 379 Online