Yup, Zero Hour change, and for me, it's one of Denny's rare big blunders. Sadly, I once read an interview* with Dixon, who I mostly love, and he made a comment that suggested he might have been a driving force for the change: Dixon said that Batman would stop crimefighting if his parents' killer was caught/solved. And that's a view I very much don't share.
*google results are suggesting to me that it will be most difficult to find this interview again, though here's an interview where Dixon says his Batman ending would see Bruce retire https://boundingintocomics.com/2022/...batmans-story/