I think it does, they are saying that even an adult-only opt-in is flawed because thats the same as the child restrictions, it's often not set up.

The last point is probably why a lot of parents buy iPhones for their children.

As for the app in question, I find nothing objectionable about it, im sure the same information is available through Safari, but i suppose the same argument applies to adults wanting to see this content, stop whining about not having an app to do it and just look it up online.