I'm a run of the mill straight woman. I preface my comments with that fact. I'm also someone who can read and understand scientific literature and the piece you noted is more an opinion piece than anything else.
That said, it's an opinion that needed to be aired.
The truth is, from my understanding is that upon conception, we all kind of start out the same and then stuff happens, development, whatever. And what we've relied on for millennia now is the outward manifestation of that development to assign gender.
What some people don't seem to be able to grasp is that it's obviously more complex that that. Way more complex. Whether it's the theory that minds and parts develop at different times and in different ways or whatever else, it's complex and in the end, it's all biology, so to refer to someone as biologically female or male is reductionist and relies on only one aspect of bioligcal expression.
But that's people isn't it? They like everything to fit in a nice neat little box and sadly, human beings just really don't fit that way.