You are a world away from me, and I never heard of this herbicide. I looked up the label and it does not say what grass it is safe for, just warm and cool season. All the herbicides I have used list what grasses they have tested it on. I had good luck on oxalis with MSM herbicide (Manor), but don't know if that is something used Down Under. Good Luck...

 

I think your zoysia will recover; it doesn't look smoked. Just about any broadleaf herbicide will control oxalis (woodsorrel). My go-to for oxalis is Celsius or Sertay (generic sulfosulfuron) but sulfentrazone and MSM are two others depending on what you can get in Australia. All of these are safe on zoysia as long as you stick to the label rate.

 

Sometimes spot-treating oxalis with a less aggressive approach like hand-pulling or using a vinegar-based geometry dash solution can help minimize damage to zoysia.