How does the PDGA/IOC policy affect a trans woman that decides to de-transition after playing in female protected divisions?
There's two ways for a transgender woman to be eligible to compete in the gender-protected divisions, one involves a period of hormone replacement therapy followed by an ongoing adherence to that therapy, and the other involves reassignment surgery (which invariably includes the removal of the gonads).
In the first case, let's assume the de-transitioning player (who has not had permanent surgery) also discontinues the use of hormone therapy, which is a logical assumption. They would no longer be eligible to participate in the gender-protected divisions, as is spelled out in the policy in section C, subsection 1, paragraphs C and E. Ongoing therapy is necessary to suppress and to continue to suppress the gonads, to stop them secreting testosterone. If the therapy is discontinued, the testes resume function (albeit possibly at a diminished level, but still probably too well to continue to compete).
Excerpt:
C. Transgender – Male to Female
Players who were assigned male gender at birth and are taking hormone replacement therapy and/or testosterone suppression medication related to gender transition are eligible to compete in a gender protected division at a PDGA event only if one of the following sets of criteria are met:
1. Transgender Hormone Therapy
A. The player has been taking continuous hormone therapy under medical supervision for a period of at least 12 months before competing in a gender protected division; and
B. The player's total testosterone level in serum has been below 10 nmol/L for at least 12 months prior to the PDGA event, demonstrated by at least three blood tests throughout this time interval; and
C. The player's total testosterone level in serum must continue to remain below 10 nmol/L in the future. If the player ceases hormone treatment they are no longer eligible to compete in gender protected divisions and must inform the PDGA by submission of a completed PDGA Gender Reclassification Form to the PDGA Medical Committee; and
D. Submission by the player or their physician of the completed PDGA Gender Reclassification Form to the PDGA Medical Committee for evaluation; and
E. The player is required to inform the PDGA if hormone treatment is suspended.
(Italics added for emphasis.)
The latter case for eligibility (the surgery route) is spelled out in subsection 2. Someone who has surgical reassignment and then de-transitions may or may not necessarily become ineligible for the gender-protected division, as they no longer possess testes which secrete testosterone, so their levels of testosterone will not go up without some outside assistance.
If they "socially" de-transition, but remain chemically and anatomically female, it certainly appears that they would continue to be eligible for the gender-protected division, at least in terms of not enjoying the competitive advantages of having testosterone in the bloodstream, but as they would be presenting and living as male in every other aspect of their life, it seems unlikely that they would wish to continue playing in the company of women. It would be mad awkward, to say the least.
If they fully de-transition and seek testosterone replacement, (typically administered by injection into a smooth muscle), they would instantly lose their eligibility for the gender-protected division, as they are now essentially transitioning from female to male, and that's covered in section B.
Excerpt:
1. Players who were assigned female gender under the criteria detailed above and who are taking hormone treatments to increase testosterone levels are no longer eligible to compete in gender protected divisions.
Source:
https://www.pdga.com/medical/gender-protected-divisions-eligibility-policy