I found it incredibly childish that she did that. Like she's trying to stick her fingers in her ears and sing "LA LA THIS DIDN'T HAPPEN". He's not Voldemort.
It's a very well known phenomenon that when there is media frenzy over the identity and "secret life" of the attacker, violence rates go up. Many attackers do this for infamy.
What he wanted - again according to the manifesto - is exactly what he's getting: further division and a clamping down on gun laws.
She also legally has to do it I believe, as Tarrant is still the "suspect" and has not been formally found guilty. She's opportunistically trying to turn this restriction into some epic "I un-name thee!" cringe fest.
What makes you think that?