Well, without the context of that "hanging" quote it's difficult to tell. Yes, it's an unnecessary draw of attention, but tbh I'd normally take that as a joke and it's your business anyway. Ok, so in this case it happens be true, but twenty years ago no police would've ever come to one's door because of that. It's like RoseyBird said, as if anyone would confirm these suspicions. It's like those silly US immigration visas, "do you intend to commit a terrorist act"? Get real.
Social media or not, I think the authorities could very easily identify most people on here, especially those of us on mobile phones with all those spy apps/os. No, I don't think they *really* care. There are so many people on here who've been ground to dust by this humane society, but when it comes to suicide everyone all of a sudden becomes an altruist. Sorry, for being cynical, but to me all there is to this is some dummy on social media who saw the reply and couldn't live with themselves (!) if it turned out to be true and thus reported it, and then police of course showed up because if it were to happen and they'd not investigated the report they'd be held liable.
Always glad to brighten everyone's day.