I imagine this is a route Qantas and AA want to jointly market under their partnership agreement which is still awaiting ratification. Perhaps they are having trouble filling it themselves and have quietly pulled it but hope to resume services if the partnership is approved.
Just a guess.
I know Qantas are waiting on the outcome to decide what routes to fly with their new 787’s. Expect a new US route if it is approved or somewhere else if it’s not.