My interpretation is that design encompasses all UI interactions, and the author feels that too many self-described designers defer to the aesthetics while underplaying other important considerations like usability and intuitiveness, even though the title of designer implies (or should imply) those.
Did an engineer design that, or did the equivalent of an interaction designer do it?
Still my point is that aesthetics, functionality, and usability are all subsets of design (according to the author).
A car is a great example how a fantastic design in terms of aesthetics can fail against engineers' (or economics) limitations. A quite recent example: BMW X6's tail lights were sent back to redesign after engineers found out that one 'beauty' line caused Cx (aerodynamics factor) increase. Imagine it happens all the time during the design process which takes years, not days.
The way it is shaped and crafted has a reason - that's design (not beauty). Though reason creates beauty.