Find that hard to believe. For a start the locals would kick up a stink as that is public parkland. Also that park was created as a noise buffer zone. A good chunk of that land was a council tip and Signature have taken months stabilising just a tiny amount of that tip so they could lay concrete over it.
Despite my comments above there was a plan many years ago to move the park and use some of the land for airport use but the locals would be right to complain if they found themselves living next to a new apron or a car park instead of a public park.