The undergraduate portion of physics is the most general and therefore the most helpful for what Elon does (really broad scope systems engineering with an ability to go fractal deep into any technical detail). And I actually do think the physics degree was majorly helpful in the approach Elon takes to solving problems in new fields. Elon is smart, sure, but not the smartest person ever. You have to credit the physics approach for much of that (and a combination of tough life growing up and extended family that provided a safety net that enabled risk-taking... the latter part could be scaled but the former shouldn’t—and may have contributed to some of Elon’s flaws). The good thing is that undergraduate physics education can be scaled to a lot of people (and aspects of its approach to solving problems adopted by other fields).
I have a physics degree. I think an interesting thing about physics education is that it teaches resourcefulness and opportunism. Physics "owns" relatively few techniques and technologies. It borrows from others, and combines things.
One of the reasons physicists like programming so much, is that it's the modern duct tape for putting disparate things together, and there's so much stuff out there to use.
Physicists are always among the earliest users of technologies -- vacuum tubes, transistors, and successive generations of computers. At my college, the earliest adopters of personal computers were all physics professors. The one exception was a humanities prof whose kid happened to be a physics major.