It’s about the social safety of transitioning. The paper you referenced is from the UK, which is famously a TERF island (trans-exclusionary radical feminists). In the TERF island, it’s much less safe to be a trans woman than a trans man. Adolescents can sense the risk of being a trans woman is much higher, so many trans women stay in the closet and don’t come out.
The radical feminist movement in the UK has existed much longer than this, since around the late 1960s to early 1970s.
2015-2016 is when rhetoric online and globally shifted towards villainizing trans women that weren't on the public's radar before. This was exported to UK politics and has been an incredible political success.
It's actually quite the contrary, the rest of the LGB looks at gay transphobes as the hypocrites and useful idiots they are.
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