The link you followed will bring you to this page:

https://www.ava.com.au/policy-advocacy/policies/companion-animals-health/vaccination-of-dogs-and-cats/#:~:text=For%20puppies%20and%20kittens%20in,16%E2%80%9320%20weeks%20of%20age.&text=The%20AVA%20considers%20that%20all,16%E2%80%9320%20weeks%20of%20age.