"hardly vulnerable"
This person was at HMP Frankland and then at Rampton, which tells you most of what you need to know.
You don't get to go there unless you are extremely vulnerable.
Being vulnerable and being dangerous are not mutually exclusive.
He was at Woodhill, a men's prison, and it seems exceptionally unlikely that even if he was beginning to look at transition that he would have actually gone to a women's prison because of his background - the women's estate just wouldn't have been able to manage him.
kua Private Eye have covered quite a lot.