I got the impression that when mentioning HIV and toenail infections etc., he's talking about the overall technique of a "nanomedicine" delivery via a hydrogel that "self assembles" when it comes into contact with water.

The specific instance of that which they are currently focusing on appears to be targeting only bacteria, but since the method is focused on mechanical destruction of the cells, presumably they might be hoping that they can adapt the technique to detect and destroy other things as well.