If they didn't do any repairative maintenance on that coffee machine for days, it would save them for sure.
Ie, left the machine like that for days.
No electricity used there while the machine is out, etc.
We don't know why, or how long it would have been left in that stafe.
If it was a broken part, and they didn't repair it, it would save them the call out fee for the technician.
The Barista would of course have to work harder for the same hourly wage.
But their KPI would still be up, as the Barista would always be on the move making coffee, no matter if the people wanting the coffees went up 15/20/25 fold in the hours that the machine was not working.
Not sure if the Aust QF dom lounge Barista/food replenishers/cleaners are still Accor staff, or another company, but for pretty sure they would not be QF staff, as the lounge is a non core activity.
Edit: yep, Accor has it for 7 more years, just read it on a hotel management website.
Both QFd & QFi lounges.
So the repair of the coffee machine would be extra cost, but the Barista who has to work harder, for more cups, there be no difference in the contract amount QF pays Accor.