It's interesting, Redd5 seemed to be suggesting that Batfleck prior to the fall committed to the no-kill code at a level that Nolan's Batman didn't, and that the movie assumed knowledge of his no-kill code on the part of the audience. However, putting aside that I think any version of the story has to stand on its own, the general public only knows the no-kill code as it was handled in Nolan's movies. They're not going to assume that Batman never killed anyone under any circumstances before he lost his way. And after the Martha scene Batfleck still killed. I didn't question him killing a team of criminals who were holding a woman hostage and planning to murder her, but he didn't revert to some state where he never killed, no matter what.
Man of Steel/Batman v Superman at least seemed interested in Superman's policy on not killing (I know it looks like he killed that guy at the beginning of BvS, and how it comes across is ultimately what matters, but that doesn't mean it's what Snyder intended), but it doesn't seem like he's into Batman being strictly against killing, even if he cares about the implications of how far Batman's willing to go.