This kind of confusion has happened before at Sofia too, due to the fact that the current twy H was formerly the main rwy (09-27). A new longer runway was built slightly to the north of it during the reconstruction of the airport just a few years ago, and even though the old rwy is now only used as twy H and marked accordingly, it still has the width, surface, wear and tear, associated with a runway. This being said, it's the first time I've heard a plane actually starting a takeoff roll on H.