I used to drive to Tyagrah most weekends as a teenager (16 odd years ago) so my sister could go horse riding up there. Last time I went through there I recall a much wider and faster highway now runs through the middle of the area which I would bet makes more noise constantly than any aircraft. From google maps the area is just as isolated as it used to be and the only nearby properties are all rural.
I would wager its some new resident expecting to move into hippy town and is upset they can't hear the whale songs they expected while lit up.
Maybe some Rhino drivers could do some practice airfield attacks on the way back from Evans Head, show them some real aircraft noise.