Also when I first saw the headline, I (incorrectly) assumed it was an auto-posted obituary and clicked to see the tech. I could see in this scary political climate, with US morality on the rise, and a few prominent new "DeathTech" startups, this audience might be curious about tech for EOL planning. Long time HNers (the ones who are more likely to vote on articles) are aging and that cohort are now in their 40s–50s and increasingly aware of their mortality as they themselves, family and friends confront challenging medical issues.
I think it's of interest because (1) it implicitly presents a question of how to go about a premeditated end-of-life message to be shared in an online space.
And (2) relative to typical prose in this context, it's a bit cheeky, more like an "aw, shucks" than a grand tragedy. Something about it reached across the veil of impersonality, again in a digital space. And to me at least it's raising a question of how you choose to express yourself and how that choice gives you life in the ability to be regarded and known by others, and perhaps an even more general question of how we're all already doing something like that on a day to day basis. I don't think anyone who voted on it said any of that stuff out loud but you could feel those themes as implicitly present even if it's hard to put your finger on exactly what they are.
To your point I don't think it's the only message that has questions like those behind it, but I don't think it's ever been teed up for community discussion quite like this.
Edit: I'll obviously get downvoted for this, but that's my point of view. I'm from Europe.