I may be being silly here, but it seems to me that if someone who existed says that the name they used is now a dead name, they are now dead.
They can't have it both ways, surely? Either that person is dead, or he isn't.
And mourning them as dead would be easier all round. Also, if the person who was a child's father is dead, how can he have access to the child? He no longer exists. A stranger woman demanding access to children seems very dodgy to me.
(I feel a bit strongly about this: the first trans widow I knew eventually killed herself. The ex-partner is still throwing considerable weight around in the Cause of Trans, very obviously.)
NotAtMyAge, I wrote this before I saw your post!