This doesn't look like a "Hey look how much I improved HN's CSS!" kind of project. It calls itself a "HN clone built with Vue 2.0 + vue-router + vuex, with server-side rendering", so one presumes that it was made to showcase those things (as opposed to, because the author felt HN desperately needed a front-end framework and thumbnails).

I mean, if you think it's using Vue wrong then flame away, sure. But critiquing that you prefer HN's current design strikes me as a bit like going to a "TodoMVC in framework X" project and commenting that you prefer to use paper and pencil.