Steve Wozniak isn't an entrepreneur. He's an inventor. Steve Jobs was the entrepreneur and convinced Woz to do things his way (i.e. the way that ended up working).
Marissa Mayer is not an entrepreneur, and she's not even a good CEO. I'd argue she's an absolutely abysmal CEO.
Warren Buffett is certainly not an introvert if you've ever seen him speak, and his history also suggests he's not an introvert. He was a door-to-door salesman as a young man.
It's just ridiculous to say that being introverted is a benefit in entrepreneurship. Starting a company is more about people and relationships than almost any other task in life, and it's much easier when it's something you enjoy and can do naturally.