It was fun / exciting to see it work, plus from all the emails I got there was a lot of interest. I personally enjoy the collaborative nature of Hacker News, although these posts are also interesting and highlight the breadth of knowledge here.
For anyone else who couldn't figure out what's going on, the context is that the app he built (https://hnprofile.com/) has a disabled (for privacy reasons) feature that can figure out alternate HN accounts based on speech patterns.
Here's the link to the comments: https://news.ycombinator.com/item?id=17942981