Well, I haven't see any evidence that the 70s stories are back into continuity beyond 52, which theorizes that the "path" of Batman's publishing history ( rom pulp crimefighter to badge-wearing hero to dark knight avenger) is similar to the history of Batmn's ten years as Gotham defender. For instance, the comic said that there was a time when the Joker stopped killing, similar to the 60s Batman comics.
However, to say that all of the 70s Batman tales, with Batman letting the Joker handcuff him and bizarre Spider-Man references, are all valid in this continuity is just wrong in my opinion.