The github hosts the OS X build as well as files needed to build the Hacker News App on any platform supported by electron.
So, unless I'm mistaken here, this is merely a electron shell around HN with some added CSS?
Yes thats all. Thats how the nativefier works.
nativefier https://news.ycombinator.com/ --inject HNCustomCSS.css --inject HNCustomJS.js --icon ycombinator.icns --name "my Hacker News"