The distinction made to me by the mod I talked with is...
you're allowed to use past posts on NeoGAF itself to prove/disprove a point someone made (even though some mods find this distasteful as well, they won't really ban for this, unless you're derailing a topic just to take someone down)
but you're not allowed to start hunting outside of GAF to try to do a take down on somebody. Everybody has shit they don't like in their past, we all make mistakes. But when it gets this far just to win an argument it's a bit creepy and uncomfortable for all involved.
I pretty much see where the mods are coming from. They have a very difficult job to handle, trust me