Well designed .js based, interactive link analysis functionality capable of taking feed of external data and showing links and relationships between nodes in a way that does not look like a mess on the screen.

Don't confuse it with Google page links to each other. It's not about SEO. It's about having an ability to visualize relationships between entities.

(A)->(B)->(C)

      |

      v   

     (D)->(E)

None of D3.js can do it properly

I believe he used one of those marketing phrase generators when he came up with this response.