A reply from Australia Post to my complaint sent only yesterday that reads:
Thank you for contacting Australia Post.
Australia Post is an inclusive organisation that values diversity and is committed to fostering a respectful and welcoming environment for all people, including LGBTQIA+ communities.
The Harry Potter Owl Post Experience was a promotional fan event delivered in partnership with HBO Max to celebrate letter writing and provide an engaging experience for Harry Potter fans.
We apologise if the activation has left you disappointed. We understand your concerns and your feedback has been heard and shared with the relevant teams. As a result, the partnership has now ended. Your feedback will also inform how we think about future partnerships and activations.
I've highlighted the section that says "As a result".