The fluid in D3O is encapsulated in plastics, which is how it maintains its scratch and tear resistance. Whereas the entire structure of the hydrogel in the art

The fluid in D3O is encapsulated in plastics, which is how it maintains its scratch and tear resistance. Whereas the entire structure of the hydrogel in the article is bare, which means the friction of a rotating tire would easily rip it to shreds -- which is why they sandwiched the gel between two sheets of something in the video.