They're official and about to die by the looks of it.
However, you still need to ask whether you're allowed to use the tag.
Dead official clans still withold the right to their clan tag, pm ruadhan asking bout it.
If he says no then you will need to start your clan again with a different name and tag.
She/They
Yeah, I only don't like erthtkv2 because of the mod's name. Make it "tkv2," and the mod will instantly become more popular. This is a valid reason as the name of the mod is still an important feature that no one seems to have yet discussed.