I am not sure what exactly do you mean is not true. But in fact the article you linked says about pre-gdpr cookie consent. So it kind of contradicts what I said. But in practice to gather such consent it was allowed to say "if you don't consent, please disable cookies in your browser" and that's what I meant about "I understand" button. Regarding the exempt for this notification, I am not sure if CF cookies should be considered as strictly necessary.