Pardon my ignorance, but who is an unperson here?
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
[edit] I thought Foone, always good content, but they don't like HN either "I'm gonna have to email [HN] again and finally get them to just ban me from HN. this has happened too many times" https://twitter.com/Foone/status/1574140918478692352 but seems it's not https://news.ycombinator.com/item?id=32975173
Was this recently? I think that in modern browsers that has come to be locked down. I'm not fresh on the details, but the gist of it is that a given web page can publish a header which tells the browser what to do when users navigate away from that page. Whether to reveal that page as the origin or not.
I think HN can make it impossible for a site to know that a visitor "came from" HN.