Fate is just one shotting everyone left and right. Yeah that is including Phantom Stranger, but it was more like he trapped him. He didn't get any damage from Phantom's attack then he said if i cannot kill you i'll just trap you here, thanks for trying. Goodbye. Then trapped Stranger into his helmet.
Also he is still the same Fate, he didn't get retcon like other characters. Original Nabu is in control.