https://www5.austlii.edu.au/au/legis/cth/consol_act/ca191482/s3la.html
It does require a court order, but notably you do not need to be suspected of a crime.
Dont we have a right [...] to not self incriminate?
Not that I'm aware of, but if you find otherwise, let me know!
Is this real? I have no idea how to even access twitter anymore