Can you define male puberty though? Like qualitatively in specific terms and with specific language?
Being pro trans is being pro women. Excluding some women from women's sports would be discriminatory to those women. In this case those women are transgender, and they are being excluded because they are transgender. Which would be opposed to their right to participate, a right we recognize for all other women and girls. That would be anti trans, in this specific context. It doesn't mean you oppose all of trans rights, but you're actively supporting the exclusion of trans people from professional athletics.