I was there yesterday afternoon. Obviously there were no CX passengers, and the last AA flight had left, so it was just a few AY customers. We got kicked at 17:30 as the lounge closed entirely, and advised to proceed to BA's (but why bother for 10 minutes).
I don't really get the logic behind AA sending their passengers to CX and keeping their own lounge closed, while CX keeps their lounge open with no passengers of theirs...
The QF lounge looked closed too, though I could not immediately locate opening hours.