I think the issue is with what is implied by the headline as well as the context of being posted on a privacy community. I as well as many others probably ready that headline assuming the police somehow had access to that data from the app outside of the person's phone. I know that also makes some assumptions, but probably the ones most people on a privacy community are thinking/making. Most of us would be assuming that if the app was sharing this data with police, or the police had some back door way of accessing it, then this would be a big privacy news item. The fact that they viewed the data on an unlocked phone and app is much less a privacy concern, more of a policy concern that they are allowed and able to do that (admittedly, still privacy related but to me this is like 80% policy concern and 20% privacy related). Also what actually happened is pretty different from what the headline on a privacy community implies which is where people are having issue. Some examples of this to make it even more clear...

• Statement: Facebook post "My aunt got her covid vaccine and died within 24 hours! Don't trust these vaccines!"
• Implication: The covid vaccine killed her.
• Reality: She was in a car accident on the way home.

The statement isn't technically false. The first sentence is true, the second sentence can absolutely be the opinion of the poster. But the combination implies that she died from the vaccine, something totally different from what actually happened.

• Statement: c/Privacy post "Police use OneNote information to convict murder suspect!"
• Implication: Moreso because of being on a privacy community, most would read this as police somehow having access to OneNote data either through sharing or backdoor.
• Reality: Suspect had a print out of their shopping list made in OneNote consisting of a shovel, ducktape, bleach etc and coordinates of a remote spot where body was found laying on their desk at home.

If it was posted to a non privacy related community, the assumption that there was a privacy concern may be much less, but I think the headline would still be misleading. In the facebook example the person was misrepresenting what happened to push a political agenda that vaccines are bad. In both the murder example and in the article linked in your post, the headline is trying to misrepresent what happened to increase engagement.

There are very clear reasons why the headlines weren't the following:

• British police use data found on unlocked phone to investigate miscarriage. (Still concerning for reasons of morality and policy, but probably not going to get tons of attention on a privacy community)\
• RIP my aunt who died in a car crash on her way home after getting the covid vaccine.
• Police convict murderer found with evidence of crime on suspect's desk. (Yes, I realize the list isn't "evidence" per say, but you see what I mean. This post would not get any attention either.)

Since this got really long, it's important to say I was just trying to show how the headline is misrepresentation of what happened. I don't think you posted it with any ill intention or that there aren't other moral and political issues with what is happening.