I find that "gets energy from interaction vs lose energy from interaction" is more productive than "shy vs loud".
I was visibly shy for first two decades of my life; I look (and am) a "people person" for the last two decades and most recent friends/colleagues wouldn't know I'm an introvert; and I'm doing reasonably well in people-manager role. But whereas after a hard day my sister wants to go out and party and this will rejuvenate her, after a hard day I want... nay, need, some "me time" - alone with book or computer or tv or music to recharge. I'm stereotypically the first person to leave a party of my best friends - I love them, I love our time together, but at some point I had enough input and need to depart.
My point is: I think "introvert" is a defining characteristic of me; but "have people skills" is just that - skills. I don't think I'll ever change whether I gain or lose energy from social interactions; that seems a pretty built-in aspect of my personality. But I can and did tremendously change how I actually interact with people - it may come easy to some, harder to others, and seemingly impossible to yet others, but it is in principle a learnable, acquirable skill.
So, "6% of Business executives think introverts have people skills needed" makes me think this is an accidentally tautology - I'm pretty sure they mentally have defined "introverts" as "those with poor people skills", and that's not I think the most accurate definition.