The title makes it seem like being poor will make you more likely to be trans, while the study itself in fact says the opposite.

Neither of these actually. There’s a correlation between being financially disadvantaged and self-reporting as being trans, but it’s important not to jump to social conclusions, because so many factors could be at play.

For example, being financially disadvantaged means you already have almost nothing to lose, so the pressure of the social stigma may be much less, and it’s much easier to report. The study just concludes that there is a correlation, but not any cause-effect relationship between the two.