While the markup doesn't do anything for SEO, Easter eggs like this are often created to help generate links back to the particular page from sites like HN...which can boost SEO.

The original submission title was probably tongue-in-cheek, but I'd bet the creator of the page had SEO in mind. Getting a ton of pg lovers who probably also link programming to link to a programming page on the site would be killer for SEO.

This is similar to creating a unique 404 error page that can generate tons of backlinks.