Drawing a distinction between privacy and security is kind of nonsense in this context. While they are technically different, they're only different in the way that an apple and a fruit are different. Privacy is an aspect of security.
If your privacy was violated in any other context you would not feel secure.
Terfs by definition exclude women and are therefore not feminist. Hate groups often try to legitimise themselves by adopting more reasonable names even when it goes directly against their views, eg "All lives matter" formed specifically to counter the claim that black lives matter.