Oh. That's interesting. So there are two different pages for the Hong Kong lounge on the Qantas website with completely different opening hours! The first one is the only one returned if you search "Hong Kong Lounge" on the Qantas website!

https://www.qantas.com/au/en/promoti...ng-lounge.html
https://www.qantas.com/au/en/qantas-...ng-lounge.html