It's engineering, at this point.

I'm quite sure that Musk understands the engineering totally and makes important contributions. Plus, his instincts in providing direction as a CEO are excellent. Very few CEOs understand tech like Musk does.

At least during initial days, Musk spent 90% of time on engineering at SpaceX. He self-thought in rocket engineering and can easily match knowledge of many experts in the field. Many of big engineering decisions were done by Musk, at least until Falcon 9.

Seems as much a rocket scientist as anyone.