False equivalence. XY humans destroy XX humans in sports, it's why we have men's and women's divisions - women are a protected class. Allowing XY individuals in women's sports is not fair to women, and undermines the entire purpose of sport and a women's division. Look at it this way : men's division is really an open division, but we created a women's division for the purpose of fairness.
Second point, let's just say you don't know how much I know about this topic or these issues. The question of reversibility by using hormone blockers is still being debated. We simply do not have enough data to know if its safe. You cannot treat hormone manipulation as some simple process. There are many feedback loops involved in the HPG axes.