CryptoMania should be able to answer it (or maybe theymos with the IP log data). But it seems like DontMe has managed their ANN thread, and possibly their communications on this forum. I guess they trusted DontMe.
What bugs me the most is that there's even no warning that they would be changing "managers"/"accounts" in the old thread. This is the last
post in the old thread before it was locked. Definitely not a warning message. Just out of the blue. Contacting the site would be ideal.