Greenwood is Batman, and that is sort of jarring because, at least for me it's like JFK being Batman. But also to be fair, I didn't catch it was him until almost the end.

Yeah... this works but it doesn't seem to know if it wants to be Victorian London or H. H. Holmes Chicago. It really can't make up it's mind, and since Gotham is fictional it still works.

It's a fun Elsworlds story made to break continuity and let the writers play around a bit, and, Batman not only fits the era, but they did a very good job of bringing Bruce Wayne into the era as well, and that is what some writers tend... read the rest.