yeah, agreed - Gaiman's fans are far less willing to tolerate his SA, HP fans are more general public and transphobia is more socially acceptable than SA.
Basically this post is essentially saying, "it's a shame transphobia is so acceptable to people"
The only tension here is that even if we lived in a fully trans-accepting society, people with gender dysphoria (unlike being gay) would still requires medical treatment (much like any other endocrine disorder).
It's great to recognize trans folks as a part of the natural biodiversity of humans, but there are limits to that claim.
This article's main concern is how the RNZ article handled reporting trans issues, from OP's link:
As far as I can tell the RNZ article does not directly depict being trans as a problem or pathology as much as they tell a story that indicates the teen's trans identity was not authentic or legitimate, quoting from the RNZ article:
Mostly the article comes across as conveying the skepticism around the trans identity, highlighting that before V died they reversed their trans identity and reaffirmed their assigned gender.
I think the RNZ article does come across as dismissive, but not necessarily as pathologizing, unless I'm missing something. A charitable read is that they are highlighting the need for clinicians to better parse gender dysphoria from other psychological issues, and to take those seriously, but I tend to think articles like this are not being written about the way people are getting misdiagnosed one way or another and not given adequate psychological treatment - autism mistaken as OCD or ADHD and so on - so reading between the lines I see an attempt to write something that can be used to credibly stoke moral panic about and undermine trans identities with the public - using the death of a single individual and making the argument that this was caused by too much focus on gender identity allows audiences to easily draw their own transphobic conclusions.