Now I understand that had a link to a particular murder.
The whole point though is that women and girls are murdered because biologically they are girls.
In the case you cite, the wearing of jeans instead of a skirt does not mean that she was murdered for being like a trans person simply by her non-conformity to expectations though.
It would have been because she would have been seen as ‘modern’ and of loose, Western values sexually. Jeans are seen as being sexy and showing a lot of the body. They would have wanted her to be ‘modest’ then marry as a female virgin, so that the man she married will not have to feel jealous, or worry that a child, which she would carry in her womb as a female, (not a man looking like one) might not be his.
No where is there any real analogy with trans people.
I take your point that people should not have to conform to stereotypes socially expected of them because of the sex they were born. I disagree that not conforming to stereotypes means someone is effectively the equivalent of a trans person - in this news story it is still about the female sex.
Murders of trans people largely take place in the sex trade ( where many women are harmed too). In the U.K. there are very few murders of trans people.
Thousands and thousands of women and girls are murdered every year around the world, and plenty in the U.K. too.
In no way was Dr Blackbird mentioning the murder of women and girls a transphobic remark.