The title should be "Clustering HTML pages". It's not a terribly interesting application. The only thing new I got from it was a de-noising technique.
So they extracted features, clustered the pages and found... what?
I am sure they learned something but it might be proprietary.
On the more serious note I would not mind a but more critical and less clickbaity attitude in the tech. Not every if statement or regexp is ML and AI, not eveything requires blockchain.