I think this is a failure of education. As the author points out, learning MS Office shouldn't be the first step, learning the principles of technical problem solving should be. That most computers operate the same way regardless of what they look like, and that you can draw inferences about what's wrong, and where to make changes. It seems like drilling in 'try a few things and then google for it' (as we all do) would help a lot.
Certainly unwillingness to teach can be a problem, but I think often it's born from the experience of solving the same problem for the same person many times over, and seeing their unwillingness to learn. </huge_generalization>
But consider the number of times you've used systems and libraries that you do not understand beyond the subset of its API that interests you. I do not understand the details of my computer's microprocessor's architecture, yet through several layers of abstraction it is a useful tool for me to get my job done.
There are other systems, too, like processed food. Traffic control. The power grid. The military-industrial complex. Whole industries have their internal workings abstracted out but for the tiny intersection between them and our individual lives.
Sometimes the guy who's using the jQuery library is, say, running a startup that has other, more pressing priorities, and has no time to learn anything beyond .ajax() and .append() .
So while your specific example makes sense, I don't think the point you are trying to get across is extrapolatable beyond it.
In your example, you need to fix a specific broken mechanical part, which takes time and resources to fix if it was designed to be fixed at all by a home user. In my example, the information is freely available, costs nothing to duplicate or implement, and is simply a small investment of time--which will pay huge dividends if made.
Most computers even come with all the tools needed to fix them, something which cannot be said for cars. It just takes patience.
It's a lack of critical thinking and problem solving ability, that's all.
Exactly these abilities that most people do not have. And those who do are usually called "engineers", "programmers", "doctors" etc.
The computer is a device that, most of the time, just gets in the way of doing X.
But the OP of the quote misses a qualifier: the person is trying to do X on a computer! They can use paper and markers/crayons/pencil + xerox machine, not like PowerPoint is the only option.
And every IT person with bad manners or an unwillingness to teach whatever they know and answer questions is complicit in this farce.