That wording has been the case for around 8 years. Long before Joyce. From my understanding is the only time the clause is used is during operational disruption or when dealing with very large group bookings. I have used it very frequently in and out of CBR on the jet service where 90% of the plane seems to be platinum and still had no issues even when timed with last sitting days or end of visiting head of state. I have never had the request denied.