Introvert Exclusion?

I recently read an interesting article on Projecttimes.com in which they laid out what they consider to be the Anatomy of an Effective Project Manager. What I found interesting though, was that the very first core characteristic they listed, was that the individual must be an extrovert. They went into more detail by saying this,

First, the need to be an extrovert. It is commonplace for project managers to give presentations and lead work groups. After all, a project manager’s job is 90% communication. The audience for their presentations range from project teams to project sponsors and perhaps customers and/or investors. A project manager needs to be comfortable addressing any size of stakeholder and/or customer group in a wide variety of situations. An introverted person will likely have to undergo long-term training and coaching to come out of their shell in order to be truly effective in all environments. Extroverted people tend to exhibit a natural comfort in such situations and are at an advantage.

This struck me on a couple different levels. First and foremost, I would consider myself an introvert; and even more so, and introvert who is interested in pursuing project management. But I can't help but feel that the person who wrote this might not completely understand what an introvert is. Being an introvert, I tend to best recharge when I am alone, so does that mean I can't handle working with people? I actually rather enjoy working with people, and I enjoy communicating with people. I typically have no problem talking in front of people either. And as John Brandon says in his article on Inc.com, your personality type doesn't have to define your leadership ability, but that leadership is instead a learned skill, not necessarily a natural trait only found in extroverts.
Rachel Burger in her Capterra Project Management Blog wrote about this same topic, and she mentions that,

Instead of being a handicap, introversion can help leaders succeed. For example, in The Introverted Leader, Jennifer Kahnweiler notes that introverts take more time to prepare for presentations and think through their goals. They tend to avoid the pull to multitask better than their extroverted counterparts. Finally, Kahnweiler adds that introverts tend to be better listeners. For project managers, that means that introverts are likely to be more in tune with their team.

This is something that I can agree with more. Thinking of this topic in this light offers many more opportunities than simply placing certain personality types into certain job positions. Instead of excluding introverts, why not allow them to shine in their own strengths, while at the same time giving them a chance to grow in areas they may not be as strong in.
Also, I pretty sure I'm going to buy that book ASAP.