On the contrary. If you read the article, nobody said being a Boing propulsion scientist makes him all-knowing. The statement was as a response to a programmer's exclamation that "our customers are morons!". The fact that he was a propulsion scientist is a strong indication that he was not a moron, thus making it reasonable to have a look to see if perhaps it wasn't the users there was a problem with.
The goal of the project was to make Windows "discoverable", in essence making it possible for the average person to figure out the most important things without attending a training course. A reasonable requirement for a commercial consumer product. The user tests demonstrated that Windows 3.1 wasn't discoverable.