alt Hacker News> had only ever submitted two links, and both were to userplane.io
That doesn't appear to be correct. The account's public submission history shows multiple submissions beyond userplane.io. Here's the submission history for reference:
https://news.ycombinator.com/submitted?id=wizenheimer
Edit: Looks like my original comment was flagged too, woah
You're right, I was looking at submissions for userplane.io[1] and over-fixated on it only being submitted twice. My mistake. Nonetheless, the basic principle is the same. Looking at their submission history it appears to be almost all self-promotional and correspondingly many of the submissions are [dead]. As far as I can tell, that's what happens here. (aside: I'm just commenting based on observation of the years, I'm not anybody "official" here or anything).
[1]: https://news.ycombinator.com/from?site=userplane.io