This implies that males who identify as women but do not undergo HRT are not women in the context of sports (and their gender in other contexts remains ill defined, especially in the absence of perverse incentive). This is a form of misgendering, which is what we were trying to avoid in the first place.

    This is a position that one could take up, but it comes
    at a steep cost. It holds the societal acceptance of
    transgenderism hostage to a biological account of
    sex-gender. This is problematic for several reasons.

    Moreover, it is worth highlighting the problems with
    suggesting that sex, as biologically based, determines
    the gender with which one psychologically identifies
    [...] Second, whatever criterion is offered to ground
    this similarity would inevitably disqualify many women,
    for not all women share the same hormone levels,
    reproductive capacity, gonadal structure, genital
    makeup, and so on. (Tuvel 2017)