Nope, sorry, you're wrong. You are the exact definition of an introvert. You're in a social environment, surrounded by other people, and instead of interacting with others, you're lost in thought about something else entirely.
Just wikipedia it: Introversion is "the state of or tendency toward being wholly or predominantly concerned with and interested in one's own mental life". That exactly describes the behaviour you're relating. Now, being an introvert isn't a problem, but that title tells me that you're no so much concerned about introversion being a problem, as you are about grandstanding and making your "busyness" mark you as important somehow.
I for one think I did never fit into one or the other category, I'm an extrovert sometimes, and introvert at some other times.
One thing is certain is, when I'm problem solving, I don't want to talk to people, because I need to preserve the mental state of my reflexion. And it is very annoying to have to justify that all the time at work.
So for me, wether the author is really an introvert or not in the grand scheme of things is not important. What is important is that a lot of people don't feel like talking when they do this kind of jobs, and for a very good reason.
Just wikipedia it: Introversion is "the state of or tendency toward being wholly or predominantly concerned with and interested in one's own mental life". That exactly describes the behaviour you're relating. Now, being an introvert isn't a problem, but that title tells me that you're no so much concerned about introversion being a problem, as you are about grandstanding and making your "busyness" mark you as important somehow.