Also assuming you are right about the Iogs, how is it related to him not receiving the same PM? I don't think Theymos uses and IP address to send a PM, he would simply get a list of all users who include the member he wanted removed and send them the same PM and that's all about it.
I would presume theymos compiled a list of those he wanted to send the PM to, and part of the criteria would be based on who is associated with lauda and related alts (of lauda and of those associated with him).
If someone were to share say an office, or a home-office or a home with another person, it would probably be a pretty safe assumption to say they at least sometimes share an IP address. If they (sometimes) share an IP address, they might show up as a possible alt. I am however specifically saying he is not an alt of someone else that posted in the thread in question.
Anyway, perhaps you should ask suchmoon if there is
any other reason why she might have wanted to lock the thread besides the alleged "off topic" posting