It is said that no-one knows what she believes because she doesn’t believe anything. She is psychologically detached from convictions. That would explain this weird u turn.
I wondered if it was that she wanted to introduce laws & policies to help trans people. But currently the only way to do that (according to trans rights orgs) is by stating beliefs like trans women are women, trans people are the gender they say they are, everyone has a gender identity. These beliefs are not actually true, but currently no one is allowed to pursue better policies for trans people without claiming to believe this. So that's what she did.
Maybe she does believe it because the way she is wording things suggests she is doing it in a way that still allows twaw to be true.
I would prefer it if she said 'my position on trans rights is well known by my past endeavors' and then set out what her current policy position is, stating that she will not pursue self id if that is the case.
The big question is, of all the other policians who have pushed this - Maria Miller, Theresa may, Caroline noakes, layla the soul seer and many others - which ones will abandon and deny as soon as it's politically useful?