Those are in fact the core issues for Aboriginal Australians. The deaths in custody is what the media focus on however, because that's a very simplified way of framing the narrative, with clear heroes and villains and a simple solution: "just don't kill them".
However they've had multiple royal commissions into those deaths over the last 30+ years and the death rate for Aboriginal Australians in custody is actually, surprise, lower than for white people in custody. That's because the people who are managing those prisons are completely aware that if a black person dies in custody that's going to be national news, i.e. they're totally on top of that, whereas if you're white and die in custody, well when's the last time you even heard about something like that? it happens overall more frequently than black ones but they don't get reported. White people who die in custody in Australia apparently aren't newsworthy, a quirk of how the media narrative works here, and the prison authorities are aware of that, so they clearly over-focus on preventing the ones that are going to be the PR disaster if the occur.
The focus on the death in custody thing is therefore a massive societal cop-out to avoid having to deal with all the problems you listed, which would actually require the entire society to look inwards, whereas the narrow "death in custody" thing allows us to assign blame for one profession for the whole problem. A black person dies in custody and we all tut-tut and say "someone" should do something about that. Someone who isn't us, basically. So the media fixation on that one thing actually serves to sweep those bigger problems you mentioned under the rug, by focusing on the idea that law enforcement are just big meanies, and that's the entire problem.
And that brings up another question. Is the focus on the role of the police overly narrow? Are they to some extent being used as a scapegoat for problems that are in fact the responsibility of society as a whole. It's a convenient cop-out to just say get rid of the police and therefore all problems for black people would go away. While it's obviously horrible that some cops kill black people, the vast majority of black people who are killed are not killed by police, and there may not be a specific reason to think that would get any better without police around.