The timeline of the Mirror Universe was changed by that.
Yeah, I hate that they mixed the MU up in Tholian Web on Enterprise. But when Kirk talked about having a whole universe to himself, it sounded to me as if that meant not even the Defiant was there. Just an impression. However, Kirk and the Defiant phased out of our universe together. All those dead people certainly stayed in the Defiant's new universe. Why wouldn't Kirk? Anyway, if a third Kirk-alone universe (and how would he know he has it to himself?) was involved, a second phasing must have happened, where Kirk is ejected from Defiantverse.
I forget, did all those dead bodies make it to the Enterprise episode?