And?
Oh, of course you do. You wouldn't have pointed it out otherwise!
Very astute of you to detect the obvious sarcasm, yes.
It seems to have been a scholarly enough article for the US Government "National Institutes of Health" to publish on their website
Within its context, yes. But for posters to try to extrapolate inferences out of that context, not wise. See below.
Try reading the actual paper (~700kb PDF)
You will find they have included all their raw data (unless of course, you think they have done an Andrew Wakefield - who is English by the way) and faked their data?
The study size was 73 individuals. Starting right there, the very small sampling should have us reeling in too many conclusions regarding millions of western trans folk, which is the obvious intent. But it's fair to point out that sex changes are going to be a small group by nature, so:
The study was performed in Iran. You think, I suppose, that this population is globally representative? I think not, considering that Iranians have diagnosed personality disorders at rates estimated at three times the global average. And of those disorders, guess which is the most prevalent (as in most Islamic cutures)? That's right, narcissism.
Personality disorders (PDs) are severe mental issues, while the information in the common population is not comprehensively identified worldwide. We aimed to study the prevalence of personality disorders, their sociodemographic correlates, and their comorbidity with psychiatric disorders in the...
link.springer.com
You'll note that of the 84% reported to have comorbid personality disorders in the Iranian study, a whopping 57% indicated the highest reported disorder: yes, narcissism.
So we have a small study from a country with staggeringly high rates of narcissism and personality disorders, and they find that sex change recipients have... staggeringly high rates of narcissism and personality disorders, that our Brit, Yank, and Kiwi posters want to draw local inference from. This is comparing with a culture where homosexuality and blasphemy are capital crimes (although surprisingly tolerant of transgenders).
Apples and narcissistic murderous oranges FTW.
Eta: also, regarding the post I was responding to: the video author claims to have been in the study. I don't believe her, nor her random claim about autistic people believing they are transgender when they are not.
We could say it's more likely that she simply doesn't understand the words she is typing. Or we could go ahead and glean that she appears to not understand much and appears more than a bit stupid and bigoted, highly susceptable to confirmation bias, as virtually all of these random tweet authors cited seem to be.