Alright, alright. I'll play along. But I won't like it. Lets bust out the state-approved doublespeak, shall we
Our human species is (mildly, but significantly) sexually dimorphic, meaning there are a multitude of physical characteristics that distinguish the 2 sexes. At a glance, the average person can tell you that even in the midst of an impressive lineup of female athletes who train in the same discipline, our young Beatrice stands out. Why it appears that her body has developed differently from that of her competitors, as a male's would. NOTE: I am not saying she is male, I am identifying characteristics which distinguish males from females in the interest of establishing a difference in development that poses an unfair advantage
Hip width, shoulder width, muscularity, lack of fat stores concentrated in the thighs and buttocks. This is all immediately apparent even to someone with no knowledge of the fact that Beatrice has testes, as the juxtopisition of the aggregate of these characteristics with normal female competitors creates a jarring image in which it is impossible for the stark contrast to go unnoticed.
These physical differences are important to note because we know that, due to the difference in which males develop, males have an inherent unfair advantage over women. If someone who cannot be categorized as male or female (i.e. intersex) develops differently from females in a similar way that males do due to possessing functioning testes, it follows that they will likewise have an inherent unfair advantage over females who do not possess functioning testes.
Therefore, in the interest of preserving Women's sports, a line needs to be drawn here.