Oh, then I would be somewhat suspicious only seeing a single comment, especially if the site is popular and there should be more comments.
I don't think they intend it to be used. If the title wasn't "echochamber" I would be more inclined to believe otherwise, but I'm leaning towards this being satire. It's a joke - just like DICSS [0].
They aren't actually commenting - they're saving data into their browser's localStorage which is getting read and fed onto the page when they view it.
Since they aren't actually commenting - there's no way of showing other people's comments.