Considering he seems to be slightly too young to have learned all his typing from typewriters (which gives you the double spaces thing) it means he copied it from others. Which reminds me of the story (no idea if true) of a popular smart professor at a university who had a tick that while he walked he always kept touching the walls he walked past. Because he was popular and smart students wanted to emulate him and a lot of students also started touching all the walls when they walked through the hallways. That is what I think off when I see younger people emulate these kinds of old hacker things, now I'm also wondering if there are more younger people intentionally being very bad at public speaking because they see Musk do that and think that all these weird pauses is a sign of intelligence (I already have seen people say this shows he has so much going on in his mind (please, the man just has undiagnosed adhd, and he is extremely anti-adhd meds so he will never get help with it (this also explains the 'im gonna start a new company' shit he constantly pulls off))).