In other news, Google “recommends” Duck Duck Go and Bing… if you happen to type them into the Google search engine as a search term. /s
Point being, the items on HNs front page are user aggregated content and has naff all to do with HN itself.
To elaborate: I feel that the irony comes from an apparent desire by this website's users towards supporting IPv6, as evidenced by a few articles about the topic on the first page today; Raising awareness of IPv6 support on a site that does not.