Shellharbour mayor's dislike for all things Wollongong is well known. In this case, how dare their airport be called Wollongong Airport, so they changed it. It's got nothing to do with aviation and everything to do with ego.
Interestingly, it's generally only aviators who call it Wollongong Airport. Locals on the ground call it Illawarra Regional Airport, a region of which Shellharbour and Wollongong both belong. So if any name change were to happen, it probably should have been changed to Illawarra airport.
I'm guessing the mayor wants the CTAF calls to be changed to Shellharbour Traffic....
Unbelievable.