PR isn't something you "get", it's something you actively work for. Conference appearances, press releases, interviews, television spots, documentary participation... these all take time, energy and planning. Yes, as you get more and more well-known these opportunities appear spontaneously, but it doesn't make them any less time-consuming - I would argue the opposite, they become an increasingly important commitment. Elon
undoubtedly hustled for a lot of this stuff on his own, but I would be extremely surprised if he hasn't been supported by at least tens of individuals (and / or firms) over the years just for his personal brand alone (not including company-specific PR that's run by internal marketing teams).
The thing is; the entire point of his PR, no matter who helps perpetuate it, is built to craft the very opinion you have: Elon is amazing, and he can do it all on his own. While that's probably true to a large extent, it's not the only "truth" and reality. I, personally, am interested in the stories of the people who have helped him along the way - however few or many there may be.