You shouldn't buy it though, not if you want a real look at the experiences of the majority of transgender people, the views of the majority of the medical community, or the science that disrupts traditional western views about gender and biology.
Nobody chooses to be a transgender person. It just happens sometimes, like being born with 6 fingers on your hands. It might be difficult to fit in, but it's not bad or harmful intrinsically. Some people are different, and sometimes other people treat those who are different as a threat to them, instead of a chance to question their assumptions about what it means to be human and the diversity of human experience.
Unlike a person being transgender, that type of judgment of others is a choice. And sometimes people who make that choice then choose to write books about transgender folks to promote a political agenda, finding anecdotal situations to to justify their views.
Instead of assessing the experiences or actions of the majority of a group, they treat something deeply personal and difficult and subject to discrimination as an intellectual debate and look for ways to justify harmful policies, ignoring the demonstrated psychological benefits of gender affirming treatment for transgender people¹, or the differences in the brains of transgender people².
Sometimes people make a choice not to carry those kind of books. Amazon being huge and the effects of that is an entirely separate issue from their choice not to carry a particular book.
1. https://www.psychiatry.org/newsroom/news-releases/study-find... 2. https://health.clevelandclinic.org/research-on-the-transgend...