Some things can’t be wireframed 12 years ago
The author's point is that for some projects wireframing may not be appropriate. I've had this experience on numerous occasions where let's say a full-color design comp or an interactive prototype would better serve the concept, which may be hard to grasp otherwise.
This is especially true when taking a design first approach, or when your project gains nothing by illustrating hierarchies, navigation, or other wireframe-able things.