I think the point is that I haven't seen anything to imply that Adichie is transphobic. This is taken from her Wikipedia page:
> In 2017, Adichie was criticized by some as transphobic, initially for saying that "my feeling is trans women are trans women."[44][9] Adichie later further clarified her statement, writing "that there is a distinction between women born female and women who transition, without elevating one or the other, which was my point. I have and will continue to stand up for the rights of transgender people."
Now granted, there may be more to the story that I am not aware of, but stating that there actually are differences between "women born female and women who transition" shouldn't be considered transphobic, it should be considered acknowledging reality.