The Cabin crew agreement started to be negotiated just as COVID hit. It also came to loggerheads during COVID and border closures. Terrible timing for the cabin crew.
Qantas had a time limited advantage and exploited it. As COVID becomes less of an issue, borders opened etc then I doubt this will work as COVID was cited as the reason Qantas needed the relief about 1000 times. That’s not going to last forever. With regards to A220 etc then Qantas just try and see if pilots will take the lowest offer and fall for the scare.