surely if Miranda Yardley believed that it was all bollocks, why transition in the first place?
I don't wish to speak for Yardley (and I'm uncomfortable with how personal this thread has gotten), but you're not making allowances for the fact that people can change their perspective and beliefs over time, often in very radical ways.
Ultimately, I think women can only rely on one another in this fight: men, whether they be trans-identified or not, always have the option of changing their minds, stepping away, deciding that women and our issues aren't worth the trouble.
Nevertheless, if men want to speak up I think that's good, we do need male voices questioning this and defending women's right to speak, and Yardley has been a consistent ally of women on this - it's just that I'm aware, as we all are I guess, that genuine solidarity from men with women is rare, and they have the option of backing out of this fight if they wish, while we don't.