Firstly, the article itself says that trans women aren't women.
It's already painting trans people as an 'other' group trying to invade the bathrooms. Hooray for 'impartiality'.
Secondly, that poll specifically mentions birth sex which is extremely vague as it covers both pre-op and post-op. It wouldn't be that surprising, if people had varying attitudes from one to the other, especially how vague the media is about what it all really means.
Also, the survey uses the term gender which implies that trans people were originally mentally another gender and now randomly decide that they're now another gender and can bounce around at will with no consequences for fun.