No, you're the one who claimed the success rate of sex assignment at birth is so high. You're the one who brought that up. An example that shows how flawed the methodology was leading to that apparent success rate is entirely relevant.You keep trying to change the discussion to something else. Even the Florida bill doesn't include those with sex ambiguity, your intersex person wouldn't even fall under it. Point is biological sex and sex at birth are essentially the same thing.
"Biology" doesn't claim anything. It's a field.Biology is claiming the sex of someone. If you're male or female, that's what you are.
Biology provides descriptions for the biological sexes, based on a number of characteristics, most of which are changeable or not always required to count. Doctors, midwives and relatives then consider one or two of those characteristics (out of dozens) and assign which is the best descriptor of the child at birth. The characteristics on which they base that assignment are among the changeable ones so then may change later.
A reference point doesn't somehow gain some claim to define something that refers to it. That's absurd. That's like saying that if I call myself straight, women somehow gain a partial claim to declare me gay.Everyone totally does have partial claim on everyone else's identity. Identity is the sum of things which distinguish you from others. The decisions and attributes of others define the ways in which one can be distinguished from them.