It's quite clear that Untitled. was aware where he got the name from. In addition, making posts there about Mount&Blade (on a forum nothing to do with Mount&Blade) immediately draws relevance to this forum and therefore to LL. Whether it was intended or not, his actions could easily be seen as potentially damaging to LLs reputation, which in turn means the reputation of this forum. On a base level, I think that already justifies the potential need for action to be taken here.
The fact that he also voiced political opinions (potentially controversial ones, relating to potentially very controversial topics) is the icing on the cake as far as I'm concerned. It's completely reckless and certainly not behaviour we're willing to tolerate. Since this is a fairly rare case, it isn't covered directly by our rules. We're looking at possible solutions to resolve any ambiguity over this sort of thing but for this specific case, I don't think there can be any doubt over the inappropriateness and potential harm of what Untitled. was doing.
As for the FSE Forums, perhaps the wording could do with some retouching. I'm not sure that any impersonation cases have been dealt with on the basis of
this post but certainly someone pretending to be someone from TaleWorlds that they aren't, on that Forum would not be well received by us.
EDIT: Apparantly, I really like the world "potential". Sorry if it hurts to read my post.