title is some crazy unsubstantiated clickbait, and the article itself is a massive nothing burger. Basically, there are more trans people recorded in the poorer parts of the UK, and they generally have poorer mental health than cis people. Which is entirely unsurprising and unhelpful at this broad of an analysis.
To be clearer, the distinction I'm drawing is that the title implies causation when all the study is is a correlation. "There are more trans people in poorer areas" is not the same statement as "poor people are more likely to be trans."