Glad it helped, TheInebriati. I was trying to make sense of the claims by looking at the maths, and once I thought of the data like that, I could.
And excellent question,SetYourselfOnFire. I shall remember that.
So, no brain damaged patients with sudden gender dysphoria. Conversely, we do have emerging evidence that dementia patients who had medically transitioned can get very upset at finding themselves so altered. Which suggests something other than an innate gender identity, independent of one's body, is at the root of gender dysphoria.
This is an interesting field for me, since my gran had brain damage (caused by reckless tomboyish behaviour when she was 17 or 18) which was localised in a particular area of the brain that was later found to affect certain personality traits. Personality traits she had, and which made her markedly different from the rest of the family, but of course back then they had no idea why. She had no cognitive or physical impairments afterwards, so they never really connected the two.