Wrong. Have you heard of an Artist Often Known as Prince?
I'm an introvert. Introversion and extroversion have everything to do with how much energy you gain or receive from being around humans. For me, going to a mall is exhausting.
Just this last Saturday, there were about 5 extra family members visiting and by the time I left for my gig I was drained and ruined. I just wanted to curl into a ball and hibernate. But I showed up to a long gig and grinned and jumped around and rocked out and helped make the night. I left at 3AM with more energy than when I had arrived.
So for me, talking with family or most humans = losing energy. Playing music = gaining energy. Talking with my SO = gaining energy. It's a pretty short list of people that don't drain the life outta me.
I'm also an introvert... Very much so actually.
And while I've always been able to express and explain my introversion and general avoidance of any more people than absolutely necessary, I never phrased it within the context of energy exchange.
I'm not sure how abstract you were going with the energy thing, but it is such an accurate description- whether you mean physical/emotional energy or energy of a less tangible nature.
But I digress.
Im not the biggest fan of the phone (not sure exactly why- never really broke it down and analyzed why I don't) but sometimes you gotta do what you gotta do. I was lucky enough to have an old job at a call center which helped me practice thinking on the fly, articulating those on-the-fly thoughts through professional/understandable speech, gauging/reading others' reactions etc, but I still prefer text for day to day info. I understand the dudes request for a preliminary phone call, and I also understand the OP's hesitation. But take it as a learning opportunity regardless of how it goes.
Maybe think about why you're considering jamming with the guy, your overall musical goals as they pertain to the project at hand, and a few other basic things so that you have some things to share or talk about.
Like many others have said also, you can brainstorm and think of questions or information that YOU want from HIM; jot them down and bring them up as you see fit through the phone conversation. If you both are genuine, you should be able to tell relatively shortly and conversation will flow naturally. Hell you might not even get to the "nuts and bolts" of the call because you hit it off and BS for an hour.
Either way, feel it out and just be sure to learn something from the experience!