However, however, a bit of research shows that they followed the comic book origins precisely! https://dc.fandom.com/wiki/Batman_Origins
It's hard to accuse the comic book authors of baking it baldly into the plot, unless you argue that the killing of his parents by a small time hood is a gimmick for 10 year olds to identify with Batman's life course after that and buy comics.
To me the telling point against the superhero being noir is that noir and fantasy do not mix. Why not? Once fantasy enters in and the hero can do somersaults in the air bereft of gravity, he or she is above human issues. At least Claude had some problems as the invisible man and some trace of noir creeps in or pathos with poor Lon Jr.