Much that Silicon Valley companies do - manufacturing - was driven out of the Valley (my home for nearly 40 years) and out of the US in the 1970s, 1980s and 1990s. Silicon Valley has been largely engineering, sales/marketing, and manglement for decades. It has reached the point - note the usage of past tense - where some companies are having trouble recruiting entry-level engineers. My previous employer is near the end of moving their operations out of Silicon Valley for that very reason. The big driver of the current exodus is housing costs. Imagine trying to recruit a young EE or CS grad and telling them, “By the way, you won’t be able to afford to rent an apartment in Silicon Valley. You’ll have to live 1 or 2 hours drive from your office.”
So portions of companies and their people are already locating outside of Silicon Valley. What this article describes is true, on a broad-brush level. There are noteworthy exceptions - my previous and current employers being among them, and I could think of more that would be apolitical or conservative-friendly. Since I work in the Valley, I’m not going to name names, RO being pretty much publicly viewable. Which does mean what it seems to mean wrt the overall atmosphere of Silicon Valley.
Individual conservative tech, marketing/sales, and manglement people have no doubt fled the Valley. And that is talent that has gone elsewhere. How large that political viewpoint exodus is and will be and how visible it is and will be will be very uncertain, because it is happening within a larger long-term similar trend.