A full transformation from female to male, or male to female, is impossible. The only “transgender change possible is from male to neuter, or female to neuter, surgery and hormones be damned. Even if no surgery or hormone treatment is applied, the “transgender” is in fact but a transvestite, so long as the “junk” remains intact. Everything else is cosplay.
XX does not equal XY, nor does XY ever equal XX.
The rewriting of Title IX changes nothing, but does introduce error into the law.