Yup, my bad, i completely missed over the fact that it was only 4 years since conviction.
See here, its 10 years.
https://www.nationalcrimecheck.com.au/police-checks-individuals/resources/spent_convictions_information
The information I have read says its considered private information at that point and you do not have to declare it. I might be reading it wrong. don't shoot me people! Just clarify