@Doyoumind
I’m sure that it’s very obvious to a medical professional whether an adult is male or female when presented with their naked body.
Exactly. This really isn't something to get wound up about.
I have no doubt that the relevant clinicians (those involved in the care of the donor patient, retrieval team, transplant to recipient team) know the appropriate information.
Depending on whether there is general support for persuading people to an opt-out, it might be relevant to gather some demographic information to identify whether particular groups might benefit from more nuanced information.
There are lots of interesting narrative reviews published in this area. Sex and gender (as in socialised roles) play into who donates, who receives, and who has a better record in adhering to post-operative clinical care etc.
It is important to know who is declining to donate if it's an area of substantial need for some intersecting demographics.