Interesting! FYI the "Discuss on HN" link at the bottom of your post is broken, redirects to "submit link" page.
Hey, it seems to work now. The problem is that it relies on the HNSearch API (https://www.hnsearch.com/api) which seems to lag behind the official site by a few hours or more. I'd be interested in a Jekyll plugin that actually fixes this issue, ...or does everybody just roll their own?
If you're curious how it works, check out the JavaScript below the link, which swaps out the href if the page is found on HNSearch.