I don’t think that’s the point of the article, it refers to “lonely” conservatives, but even so, as someone who grew up in the Silicon Valley, it wasn’t a particularly liberal area just a generation ago, and lots of people, including myself, live where they live mostly because it’s where they grew up, with family, friends, favorite haunts, etc.
No kidding. You could say the same the entire state decades ago. And not too many years ago Reagan was Governor!
Now San Jose, SF, Berkeley et al are the armpit of leftist California. The entire region is jammed with leftist freaks of every description.