My suspicion is that the ban on GA is related to the opening of the air border with Spain. Gib is now much easier to get to, now that you can fly direct from Spain. Remember that every movement requires the closure of the only road between Gib and Spain and you can see the problem that too many movements will cause. A great pity because I was due to go there last summer but was prevented by delays caused by poor weather in Frnace and Spain.
Such is life.