First, I'd like to point out that they have used the Stonewall definition of trans, which includes those of us who feel that our gender does not sit comfortably with our sex. They missed out the definition of gender but I feel safe assuming that they would use Stonewall's definition here as well so I'll c&p it.
"Often expressed in terms of masculinity and femininity, gender is largely culturally determined and is assumed from the sex assigned at birth."
Yes, I definitely feel that my 'largely culturally determined' gender does not sit comfortably with my sex. I disagree with parts of that definition but for argument's sake I'll go with it.
Although the Stonewall definition of gender identity forgoes the use of masculine and feminine entirely, making that definition even more confusing:
"A person’s innate sense of their own gender, whether male, female or something else (see non-binary below), which may or may not correspond to the sex assigned at birth."
Are they talking about gender or sex here? They state in their definition of sex that the terms are interchanged. Which is a little odd, because I've always thought that the concept of sex and gender being different and not interchangeable is one of the areas of common ground between GC feminists and TRAs.
So any attempts to misrepresent us is classed as transphobia by the Lib Dems (according to this independent website, at least).
Any attempt to refer to trans people's biological sex is transphobia, but that is exactly the distinction we need to have to maintain women's rights.
Maybe I'm wrong, but it seems that by stating in this document that referring to a transwoman as a biological man is transphobic, they've basically admitted that there is a conflict here, despite us being told otherwise.