Assuming the vote is for a position on the council, I cannot vote no in good conscience whilst in a clan with many multi clan members. As for being active, I see that they are working on leveling up (or so the posts in their thread suggest), so I would say that their activity well rivals that of two fairly inactive clans (that both currently have a vote on the council despite this lack on in-game activity).
So, TL;DR, I guess that they, in my own personal opinion, have no reason not to be recognized as active or to be declined a vote, especially since they are one of the longest surviving clans that remains, despite their inactivity as varying points (which also rivals that of other clans).