PPE can be blamed either on the state government and/or the employer, and should be looked at in this case.
But the vaccination rules were dictated by federal government, so whether the driver was eligible to be vaccinated was not up to the state. The criteria were quite ridgid and did not think of outside the box jobs that needed to be thought of , so I doubt his role was covered. (eg listed jobs where you are interacting with aged care when vaccinated aged care, but not jobs where you are interacting with indigenous communties, at the same time indigenous communities were listed to be vaccinated). Yes his age made him eligible to have had AZ, but like many people who are eligible for AZ it doesn't mean he was keen to take it based on the blood clots, and the likelyhood that if he waited long enough he would get an option for something else.
