In the distant past at Cornell as a freshman, I boxed at the 150-pound level, winning one, tying one, and retiring.
If I could have, back then, gotten away with “identifying” at 130 pounds, I probably could have been undefeated, a middleweight beating up lightweights.
Much the same thing happens when a biological male “identifies” as a female, enters a female athletic competition, and wins. Unfair. Could mean the eventual destruction of real women’s sports.
Solutions? You are what your chromosomes/genes say (XY or XX), not what you say. Alternatively, have separate competitions for males, for females, and for those who are modified to be somewhere in-between.