As this article discusses, it’s not “massively underreported,” it was in major news outlets last year. Pretty sure I even posted an article on Lemmy about it.
What’s new is the scale is larger than initially reported.
Edit: also important to note this isn’t a secret hidden burial ground. I’m not defending this shitty police work, but it’s a “left hand doesn’t know what the right is doing.” I don’t think the coroner is to blame, the police should have been notifying the families in a timely fashion. No excuse to take months to tell them.
Edit 2: finished the linked article and it’s very strange. They get their facts from established mainstream reporting, then accuse mainstream media of not covering the story well enough. My linked NBC article is pretty in-depth coverage. It spurred an entire series of articles on failed death reporting by police in the USA, with most articles in the series focusing on Jackson. In other words, the original linked article is just rage bait.