Entertaining – but almost certainly a P.R. stunt to attract attention to their new film.
The fact that a real priest played the part of a priest in a movie doesn’t mean that the vows are somehow applicable to the actors as well as the characters.
Although this happened in Romania, so … who knows? I believe that is the only country where vampires receive Affirmative Action placement. Each college has to admit at least 10% vampires in its freshman class. Of course, the right-wing anti-vampire bigots circumvent this by holding all of their classes during the day.