Nobody is altering their sex. That is impossible. A trans woman is still biologically a male based on sex. Their gender is woman.

Should be posted to /confidentlyincorrect. Sure, no one can change their chromosomes, but sex absolutely can be changed and has been the case for Avery long time. The surgery is literally called sex reassignment. Sex refers to physical charcteristics, so vaginaplasty and phallopasty is by definition changing sex organs. Heck, trans women grow breasts on hormones and trans men get a deeper voice and facial hair. All secondary sexual characteristics.

Intersex is still determined by chromosomes. That is science

It's common to claim "science" when you only know the basics and haven't read any further. Chromosomes absolutely are the cause of some intersex folk, as well as cases like turners disease.