I don’t think anybody questions the fact that the “elite” (i.e the wealthy) are conservative. The 1% generally are. But the rest of the population of Silicon Valley generally aren’t.
While I haven't worked in SV yet, my experience across the tech sector has been somewhat similar. Developers tend to be socially liberal in a few areas but strongly conservative when it comes to issues of regulation, taxation and so forth. A lot of that is I believe because they tend to come from upper-middle class families or relatively more stable upbringings. It can make discussing some of the various social issue…
That doesn't match what the study claimed. At the very least, they found SV "elites" and students to be for liberal taxation policies.