The study ultimately reveals that approximately 12% of 11-year-old children, with some variance between those assigned male at birth and those assigned female at birth, indicate a desire to be the opposite sex either "sometimes" or "often," with the vast majority selecting "sometimes." By adulthood, this percentage decreases to 2-3%.
Since you seemed to miss what exactly was meant by the headline:
Unfortunately, the headline fails a fact check: the study was not about transgender individuals, but rather on people who sometimes express dissatisfaction with their sex for a variety of reasons entirely unrelated to being transgender.
To complete the paragraph you grabbed from:
In addition, 19% of the sample circle sometimes or often at some point in their lives. From these findings, the Daily Mail infers that "The majority of gender-confused children grow out of that feeling by the time they are fully grown adults," although the term "gender confused" is not used in the original study. The headline, which claims "Critics Say It Shows Being Trans Is Just a Phase," suggests that the study supports this notion.
Unfortunately, the headline fails a fact check: the study was not about transgender individuals, but rather on people who sometimes express dissatisfaction with their sex for a variety of reasons entirely unrelated to being transgender.
Yeah, the author is making that up though, drawing conclusion based on their own biases. The question is not "do you feel dissatisfied with your sex". It's asking, directly, about the surveyed's desire to be the opposite sex. Which is literally what it means to be transgender.
The second quote is just semantic straw-grasping "the study didn't use the literal words 'gender confused'!"
Please. It is completely fair to describe "desire to be the opposite sex" as gender confusion, especially in years of childhood where one's sense of self is in active development.