Public hospitals are still doing 70-80% of what they normally do as people are still getting sick in other ways, not everyone in a hospital is a COVID patient. Basically the only things that have reduced is non urgent elective surgery and less accidents.
That 20-30% is taken up with COVID patients and suspected COVID patients who aren't yet confirmed that are in special areas and aged care patients who have come from private aged care. Space has been taken up with expansion of ICU capacity replacing normal beds and a lot of staff are working in aged care and elsewhere at the request of the politicians and government. ( ICU capacity of 4000 may be australia wide but Victoria could never scale to anything like that )
By far the biggest group of health care workers who contracted COVID are from aged care but there are certainly clusters in public hospitals, the latest at Frankston. That will happen from time to time as asymptomatic workers come to work with it and various other methods but what I do know is that COVID passing between staff and patients either way has been limited but certainly not zero. That has been problem all over the world and it is incredibly difficult to stamp out and I also know that our levels in Victoria are quite low by world standards.