While I don't support the view that Sunstate are not capable of operating jets, its a bit rich to drag out 4 year old (approaching) one off heavy landing, in an attempt to discredit another operator to support the opposite view.
QF/Jetstar/Virgin/Tiger/Alliance and Airnorth (How many have I missed) have all had their turn in the spot light.
A single tail scrape is not a huge issue. If they are continual and ongoing, well that might attract some attention.