What do you not understand?
The Australian Standards of Care and Treatment Guidelines are based on the WPATH Standards of Care
This part is quoted directly from the Australian Standards of Care and Treatment Guidelines linked above:
the recommendations made in this document are based primarily on clinician consensus, along with previously published standards of care from the World Professional Association for Transgender Health (WPATH)
So the Australian Standards of Care and Treatment Guidelines are based on WPATH. (I notice I've just repeated myself, but I hope that will just make this fact clearer.)
What this means is that the Australian source that you think is most relevant is actually based on WPATH, which as you will know if you've read the Hannah Barnes article I linked to earlier, is not a reputable source.
WPATH is about as far away as it is possible to get from a scientifically based, peer reviewed source. It's written by zealots and activists, many of whom have no medical or scientific training.
Is that clearer?