Except that's simply not true.
You claimed biological sex is not binary.
I claimed that, to the contrary, it is binary giving you the definition based on gamete type (as well as pointing out that it's called sexual dimorphism rather than sexual infinity-morphism for a reason).
You then gave a bunch of bad definitions - which, contrary to your claim here, I did not offer first - and used them to claim that sex isn't binary.
Why should I care about your strawmen? Show me where I offered such definitions or admit you're arguing strawmen. It seems pretty clear to me, as per the third link above, that it was you who introduced definitions about chromosomes, hormone levels, phenotype variation, etc into the discussion.
Already have from the start, see the second link above.
"bible"
Also, no, you're not actually reduced to maintaining that as I already pointed out.
And that's a non-sequitur as well as a false dilemma, and a common one as well. Even if we assume that you can find flaws in one idea (using biological sex) that does not mean that your preferred idea (using gender identity) automatically becomes the default.
None of that follows. And even if it did, none of that entails that sex isn't binary.