I am reporting back on my son and husbands experiences.
They were offered seats on a QF flight to Sydney via Brisbane departing at 8.15pm HK time. They went to the airport early at check in, after a long queue for check in they were offered seats on the direct flight to sydney. This is where it got messy they couldn't work out how to get to terminal 2 but a guy in a white shirt befriended my son and escorted them right through to the area where they need to head for departure via train for terminal 1 gates. Again they arrived at the boarding gates and the blackshirts were blocking it. However a terminal worker opened an emergency exit and beckoned them in his direction. The blackshirts rushed the door and tried to close it with baggage carts but my husband pushed through and kicked the door open to allow my son and him through and then about 6 others before the blackshirts starting dragging people back by their backpacks and closed the door.
Once inside the emergency exit door the worker ushered them into a lift which took them down 2 floors to another boarding area. A huge number of people were lined up but security held the lines they were through immigration in about 15 mins and away from the blackshirts who started swarming in trying to block the last people through security.
They said that things had started to get very ugly in the departures terminal, protestors physically shoving travellers and getting very aggressive. Shortly after son and husband got through (in fact they were one of the last through) they cancelled all checkins and told travellers to leave the airport.
Even now they have boarded but are sitting on the plane for 1.30hrs after scheduled departure. Who knows whats happening.