When we did RTW pre-covid it could only be booked via a travel agent. We did ADL-SYD-SFO (QF), SFO-JFK (AA), JFK-HEL (AY), HEL-LHR (AY) then home LHR-SIN-SYD-ADL (QF) back then we had to go via HEL and SYD/BNE/MEL in the mix somewhere.
So this isnt a "trusted source" and I'll believe it when I see it. Mind you the CX signage is still out the front of ADL.
But availability dot com lists CX174 flights from ADL 31st March 2024.