It may be shyness, but I know I've been able to speak coherently before without much interuption. He does speak softly and with a lot of thought into his words, which would I say is a trait, but I wouldn't chalk everything about his speech up to a condition.Musk, to me, is someone who DOES have issues with public speaking like Zucherberg. Both are geniuses in their field but are a bit slow in social interactions. Especially Zuch. Have you seen him speak in congress?
But i'm not sure if they are anything other than 'shy', because most geeks are shy. And geeks usually have higher intelligence too. That's why they make things like Facebook, Microsoft, Tesla, Paypal etc.
Geeks did these things with one enhanced personality trait which is extreme focus on a topic.
Not no be an accuser, but I think there's a discernable difference whether someone's speaking presumtuously/lying or speaking the truth.
When someone's speaking passionately, they're speaking fluidly without much hiccups. When someone's speaking to make themselves look good, they're doing the "umm"'s and "uuh"'s and "so, uhh"'s every other word they speak.