Please go to your preferences page and make sure your "See Mature Topics" setting is set. Setting it to "Yes" means you see the Mature Topics forum (contains political and religious debates). Setting it to "No" means you do not see those threads.
I might have stumbled across the missing part to this puzzle this morning: in the wiki, there were two minor errors in the link URL. The URL in the text was correct. The link in the wiki should work now.
The "live chat" option above has three menu items. The first goes to the wiki page for irc. That would explain how he ended up at the wiki without knowing he was there.