The Snopes article confirms the comment you're replying to. The sentence you left out, before your quote:

> The University of Pennsylvania considers Musk to be a graduate of both the economics department and the physics department.

And right above that, from the University of Pennsylvania:

> Elon Musk earned a B.A. in physics and a B.S. in economics (concentrations: finance and entrepreneurial management) from the University of Pennsylvania. The degrees were awarded on May 19, 1997.