We don't know what physical characteristics Hubbard has. We don't know if Hubbard has an
intersex chromosome configuration or if she's had body modifications, whether she's receiving hormone replacement therapy, or anything, really.
Walk me through this, if you please. Hubbard describes themself as a transwoman. Hubbard has shared with the whole world that they spent the first 30+ years of their life perceived as and treated as a man, and that the doctor that delivered them observed them to be male.
You have no information about whether they have had any HRT or surgery in order to transition... but you uncritically and without question accept them as a "woman" and challenge anyone who recognizes them as a "man"?
They lived as a man for the vast majority of their life, they competed as a man, they went through puberty as a man, and frankly, they look like a man. But you accept complete and without reservation that they are a woman.
What information do you have that leads you to conclude that they are a woman?