I'd like to reopen this thread.
First of all, we've never had a policy against alts as long as they aren't disruptive, which that introduction thread isn't.
Second of all, we don't move non-disruptive posts made by lolwut in the upper fora to CN. Why should he be able to post outside of CN using his main, but not his alt?
Third of all, if we assume Decimus is indeed lolwut's alt, what would we gain from penalising him for trying to start afresh with an account that isn't extremely annoying? All we'd be doing is encouraging him to keep spamming CN as lolwut.
Finally, as I understand it, the only evidence we have of Decimus being lolwut's alt is a matching IP address. lolwut could just as easily have linked a family member, friend or roommate using the same Internet connection to FES. He might even be unaware they had made an account in that case. This is further supported by the fact that only three of lolwut's posts have been from Decimus's IP address; perhaps Decimus is a friend that lolwut has visited on occasion. We have no way of knowing.
I don't want to go down the rabbit hole that used to be commonplace on the old site of treating matching IP addresses as grounds for moderator intervention. I also don't think we should be penalising suspected alts before they even show signs of wanting to cause trouble.