^^^ There could be a bolian serving as the Commandant at SFa without the Bolian homeworld being a UFP member. Ro Laren served in Starfleet before Bajor was a member world, in fact while Bajor was still under occupation by the Cardassians.
Still, the Commandant of the Academy (or any flag officer for that matter) is likely going to be a Federation citizen. Similar to how people are allowed to serve in a country's military today without citizenship in that country, but they aren't going to be flag officers or running the military academy.
Well, IIRC, there is a bolian in Starfleet uniform seen in STVI. If they've been serving in Starfleet that long, some of them are bound to have made flag rank by the time of DSN. And I think the UFP/Starfleet probably judges people by their own merits as far as position/promotion, rather than by origin. Beside which, an individual bolian could have become a citizen of the UFP without his/her homeworld having become a member of the Federation.
But "official" simply indicates it is a licensed product, and not something cobbled together by someone who won't be earning the owners of the franchise any money. No, that was "Insurrection". There were blue humanoid aliens in ST VI, but there was no facial bifurcation on them.