1) Yes, they are dwarves. They are able to enter the first barrier, therefore they are dwarves.
2) The vampires where not the ones voting, the heads of the clans are voting. Sure, they used magic to compel a vote rather than political favour, or bribery, or blackmail, or impassioned speeches, or whatever else other people used to use to compel a vote, but if a vote compelled ceases to be valid, then no vote has ever taken place in any context, anywhere.
3) Dvalin is not privy to any of this. He doesn't know, he can't know, and he is likely physically incapable of knowing what happens in the chamber, because he is the god of obeying oaths and if he swore to not interfere with the council, he will be physically incapable of doing so. He has a priest that tells him the way the vote goes and, as far as Dvalin is concerned, that vote is the Will of the Council, regardless of how the members voted or how they decided what to vote for.
You seem to think you are making some kind of point, but you are not. None of this in any way affects that to Dvalin, the will of the council is the result of the vote. The vote takes place in a procedural manner, in a chamber defended by 3 separate rings of defences. If the procedures are all followed, then the vote is definitionally the will of the council.
That is a bold claim, one you have no way to substantiate. When you have to resort to inventing your own canon so you can substantiate your original claim that the actual canon is stupid, you've effectively admitted out that you don't actually have a point. Or, as Rich put it:
Not from the perspective of whomever built that chamber. Nor from Dvalin's perspective, who does not care who meddled with the vote.
Grey Wolf