I would take that article with a serious pinch of salt. It's only one person's opinion, after all, and people write all kinds of utter shite online.
Yes, I lnow how to set academic work in context: I work in academia, which is why I was able do gain institutional access to the article to read it.
This has been published in a peer-reviewed journal - it's hardly the same as kids pretending on Tumblr that they're unicorns. The author has a body of work in this area and (judging from the reference list) is not alone in writing about this. So he's not just anyone crank (which doesn't mean that his argument isn't bollocks!)
What I'm sceptical of is the existence of transabled people who are analogous to transwomen, e.g. people who freely admit that biologically they are X, but that they identify as Y, and that their self-identity means they are just as valid as Y as people who are biologically Y. I mean, transwomen don't pretend to be natal women, and despite talk about periods most don't have delusions that they are actual natal women.
The thing is, this is exactly what some of them do think, judging from what they say. Yes, some.transwomen may freely admit that they are biologically male, but their response is to claim that they are actually female, that they are somehow (in a way that has nothing to do with biology) women. This is where the whole "trapped in the wrong body" and "lady brain" narratives come in. They are really female, and if biology doesn't bear this out, then it's biology, and our definition of "woman" that must be at fault.
In directly parallel with this, there are transdisabled people who, although they admit their bodies are not disabled, feel that they are in some sense really disabled (they were born in the wrong body, they have "disabled brain"
etc). It's just that biological reality doesn't bear this out, so biological reality must be altered to make it fit with internal identity. As far as I can see this is directly comparable with transgender discourse. One of the reasons that it sounds so alien, I think, is that although society has now absorbed the idea of gender as separate from sex (and this the idea that the two can be misaligned), we don't have any concept of "disabled ID" that is comparable with gender. Our understanding of disability - even mental disability, chronic pain or neurolodiversity - is still inextricably bound up with the body.