See here for confirmation: https://www.qantas.com/ar/en/qantas-...lass-of-travel

But note that the opening hours of the lounge are 2:30pm until the last QF departure.
https://www.qantas.com/au/en/promoti...ng-lounge.html
And currently the last QF departure each day is at 19:30, so it's only useful for EK 383 and 385(ish), and not for EK381.