A different perspective
With a delayed inbound, an airline has a high degree of uncertainty when passengers will arrive at the gate especially when it's a busy airport with uncertain taxi times and a change in a terminal is required. They have two choices; do nothing (as most would do) or proactively rebook.
In this case, QF rebooked CIP passengers and got it 'wrong'. Yes, I know it was still boarding, but at T-15 they would have been offloaded and the flight closed. But my experience at LAX would be that 95% of the time what QF did would have been the best outcome.
You can't have it both ways.