Yeah I thought about those features too. Chromosomes are an indicator of sex at best, definitely not a sure sign. Gamete producing tissue can be removed, yet the now gamete-less body would still be, e.g. biologically female, right?

Even bone structure can be changed with FFS and not all afabs have the same bone structure anyways.

The more I think about it, the more I think that “biological sex” is just a red herring.