I tried my hand at googling this but found nothing but re-hashes of the same story of how he left after two days.
I tried my hand at googling this but found nothing but re-hashes of the same story of how he left after two days.
Watch the video of Sal Khan(fron Khan Academy) interviewing Elon musk.
I second the recommendation of watching the interview. There is way too much misinformation surrounding Tesla and Elon Musk.
My guess would be that you aren't technically in the PhD program until you've passed your qualifying exam. Until that point, you're a graduate student but not a PhD student. After you pass your preliminary exam, you're a PhD/Doctoral candidate.
Also, it's a moot point. There are no bragging rights to be found in simply being admitted to a PhD program. Plenty of very intelligent people fail to complete a PhD program (usually, IME, because of personality issues/conflict with the advisor (sadly extremely common), inflexibility of the advisor and/or department, or personal reasons (economic, social, health)).
(to be clear, Musk didn't brag that he was admitted to Stanford - he suggested that he felt dropping out was more useful than continuing. His fans often hold up being admitted to a PhD program as evidence of his engineering background)