Before my current career I used to work in media analysis, but you can believe I'm making this up if it doesn't fit with your beliefs
A vast majority of the time, journalists are privy to information the public does not have access to. Remember when Jill Meagher's body was found? At a press conference police asked journalists not to publish certain things, but they still went ahead and told the journalists. None of that information was released by the media at that time. Most of the time the police and journalists work side by side but there are times, of course, when the police need to tell the media to back off.
Sometimes journalists slip up and accidentally allude to things the public don't know the details of. That is an unfortunate fact of life. When the parties involved become aware of this, the article is changed or pulled, usually willingly because of legal requirements. Other times an injunction needs to be sought (for a very trivial example, see DM with the Bachelorette spoiler photos).
Then there are the trashy gossip columns that deliberately make things up (Daily Mail is the best example). There was an excellent example of this last week when DM published a photo of the Bachelorette runner up with a 'mystery brunette', even though they explicitly knew their content was incorrect. The mystery brunette was a journalist who informed DM of her identity but they went ahead and published her photo while alluding to a romance between the two. She had been interviewing him as part of her job. When called on it by her company, DM changed their article to reflect that.
Most of the time, news articles are updated constantly and they are changed to reflect the information given to them as deemed appropriate for the public. Usually, this is the straight out truth. Other times the information has to be censored for legal reasons.
While investigative journalism has changed a lot over the past years, it is - by nature - bound to publish information that then needs to be edited, either to reflect updated information or to comply with legal requirements. Journalists are bound by a strict code of ethics and while there are definitely those who do not comply, most do.
Anyone armchair detective who wastes their time 'researching' current cases such as this one (in order to point out factual inaccuracies) is going to end up with nothing but a pile of outdated information very quickly. And since you do not have access to a lot of the information, it is a useless endeavour. Journalists already know that their articles change. They report what is known at the time - and while some definitely jump the gun in hour race to be first or to get an exclusive, you can't just accuse them of being factually incorrect without proof.