Ok, I'm a bit of an amateur but they were flying into Avalon at approximately 2300, at which time Avalon tower is closed and correct me if I'm wrong but "Outside Tower hours the Avalon Class D CTR and Class E CTA will be reclassified as Class G airspace." Has this changed? They were cleared to perform the "Tear-drop," and flying visual, whats the problem?
http://www.tristaraviation.com.au/documents/acecsb.pdf