CD doesn't have to mean 'push every green build to prod'. It's more about the ability to push new functionality when asked by the business, than the fact of always pushing it by default. You may be doing CD well already, knowing just what you have said.

My preconception is that what you said is exactly right, but the idea that one maybe should push every green build to prod -- and the fact that a lot of big-scale companies are doing that -- is really intriguing.

Oops, I meant CD as in continuous delivery, but that is not what the article is discussing. Sorry! :)