I live in SF and while I don't spent a lot of time in Atherton, but homeless is most definitely visible even in the wealthy enclaves. Even before covid there was a small but visible homeless population in downtown Palo Alto (univ ave) and more recently there are tents on the sidewalk in Cupertino just down the street from Apple's spaceship campus. I think it must have become less acceptable to "move them along" during COVID.