Thanks for that link
Shedbuilder.
What's clear after reading the article is that at the heart of Joanna Harper's work is the fervent desire to be accepted as a woman. And I can't blame anyone for having such a human need.
The onus was and is on the sports bodies to evaluate the science and the data before opening up a female sport to male participants. And on that JH fails. Badly.
For starters, JH doesn't understand risk analysis. Take Ross Tucker's statement that a Rugby tackle from a male transgender player against a female player presents a 20 to 30% increase to the latter compared with being tackled by another female player.
JH claims once you take into account how few male transgender Rugby players there are, the increased risk of such a tackle is just 1%. But that's JH getting confused about two risks - the risk of a male-on-female tackle occurring and the risk of the tackle to the female player.
Because Rugby is so physical, and past injuries have had serious consequences including paralysis and death, risk analysis must consider the risk of the moves themselves, not just how often they might happen.
Then JH shows a lack of understanding of valid comparisons when claiming that it isn't valid that emerging research considers male transgender athletes who have not yet started a medical transition to be comparable to all other male athletes, because male transgender individuals often starve themselves to achieve a female model look. I'm not sure where the data is on that as JH presents none, but someone who is not eating is unlikely to be training as an athlete and so not a valid comparator for the purpose of deciding access to sports categories. Especially since we could simply compare a male transgender individual who is not eating with all other male individuals who are not eating and would find neither of them would be the same as a female individual who is not eating.
And of course the bulk of Joanna Harper's male transgender study subjects are of an age where their female peers - in addition to menstruation and fluctuating performance levels due to their natural hormonal cycles - would have experienced various additional strains on their performance due to being female, such as childbirth, nursing or the menopause, whether peri or full-blown. Harper's male subjects do not experience any of that because they are male. So it is fair to compare them to other males when establishing the baseline parameters of their physiology and their performance advantage.