Does this lay the ground for TRAs to be prosecuted for their death threats and incitements to violence?
There is no need to ground work. There is already a substantial case to be made in my opinion.
The only thing stopping the possibility of feminists pursuing a private prosecution is
a) the desire to do so, particularly in a climate of intimidation b) the money.
That doesn't mean a feminist case would win (anymore than a TRA one). Its just that the ability to do so, very much exists and is a potential course of action.
FWIW feminists would be better not to go for a case based in threats/violence against them initially, but to go for a case against a private organisation or public institution who is currently in breach of the protecting the sex characteristic of the Equality Act.
An 'attack on the individual' which a case on violence / intimidation would be framed as is more risky, in case they lose.
Focus on the issue and the politics, not the personal.
Going after the personal is a sign of weakness and desperation. Try to keep that in perceptive.