I was pleased to note that the footballer plays for a “mixed gender” team, which seems to comprise the transwoman caller and other men (i.e. a single sex team). That I can get on board with, as it is fairly and appropriately inclusive (even if the footballer is now slow and unfit since taking hormones, apparently).
Except that's not "inclusive" in isolation, because a "mixed gender" team will, inevitably, end up almost exclusively male.
That's the reason we have separate sex categories - to include women. Unless there's also a female team, women lose out.
A lot of the "compromises" end up being a mid-point between fairness to women and total exclusion of women. It's as if being fair to women is an extreme position, and we need to balance that with being unfair to women, so we end up with a compromise of being partially but not totally fair. One women's team, one men's team, and one "open" (so male-favouring) team.
Of course, if the "open"/"mixed-gender" team had some sort of handicapping or quota system, then you'd be fine. But if it's just "free-for-all", yep, it will be dominated by young healthy males.