I think it's a brilliant move by VA, similar to what QF did when they grounded all planes way back when QF was dealing with labor issues.
The biggest physical assets VA has are planes, right now is literally the worst time to sell planes as everyone is grounded.
So VA is effectively daring the govt and creditors to force VA into bankruptcy, as there will be immense damage to the tourism industry if VA goes broke and only QF emerges from covid-19, and good luck on creditors for getting the money back as I don't think you can get any reasonable price in selling VA planes in this environment.