The whole movement are absolute magpies in terms of half-inching language that was coined to describe real phenomena.
So, 'outing' appropriated from LGB
'Deadname' appropriated from some parts of the American civil rights movement (compare "slave name")
'Unsafe' from sex based violence/psychiatry
Even 'dysphoria' again from psychiatry as a rare phenomenon which is now used to legitimise changing your name by deedpoll and writing about being scared to vote in a modern democracy (even though you've been assured you can quite easily).