Wikipedia is wrong if it means the effective metropolitan area surrounding San Jose is just San Jose. People live and work spread across the entire Silicon Valley area, that is indeed why that term is used most often for the region. Since housing is expensive and difficult to find and expensive, workers wind-up spread out at close to the maximum drivable to distance, putting them at far from an easily bikable distance.
"Geographically, Silicon Valley is generally thought to encompass all of the Santa Clara Valley, the southern half of the Peninsula and southern portions of the East Bay."
"Geographically, Silicon Valley is generally thought to encompass all of the Santa Clara Valley, the southern half of the Peninsula and southern portions of the East Bay."
[1]https://en.wikipedia.org/wiki/Silicon_Valley