Sending good vibes to all of my trans comrades 
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I sorta assumes agender is often (but not necessarily always) a result of autism/asexuality intersecting with other gender stuff. Partly because that's my personal experience. But probably also because on reddit, a lot of people on the agender subreddit found their way through the aroace communities (because of things like AAA battery jokes). So... it was practically 100% ace & autistic people and that might not be reflective of the general population.
...is that biological support though? Plus, I'm certain people arrive at agender without being autistic or ace now and then, has to be. Idk, "biological support" goofy...
The idea of "biological support" seems to be overly black/white thinking imo. Just another way of talking about "nature vs nurture" when its usually more of a "nature & nurture" for everything (although questions of how much observed variations occur to observed variations in inherited factors vs pre-birth environment vs post-birth environment are essentially still looking at trying to look at the same underlying question of "nature vs nurture" without making it a binary).
So I don't really mean to talk about the biological support issue. But if its the intersection of autism and gender, then whether agender can be explained as a biological would depend on your explanations of autism and gender.
Yes that was my thinking too :3 I wasn't a big fan of the concept either, hence my annoying hammering. And yeah that's pretty much what it all comes back to, Idk I just did not dig "biologically supported" as a concept.