As far as I can tell from the schedule the minimum bus trip from this site to Sunnyvale Caltrain is 44 minutes, plus an average 10 minutes for headway. That assumes you did not start off on the east face of the UFO, in which case you should add a walk of up to a mile to get to the VTA stop on Wolfe.
That doesn't seem obviously true to me. Google for example doesn't run shuttles to Mountain View Caltrain.
Apple operates door-to-door shuttles to SF and other population centers but that isn't really the point. The point is they have obviously provisioned enough parking to give each and every one of their employees a parking space, with some left over. It's just irresponsible given the traffic situation in the area, and to call it energy efficient is greenwashing.
Walking would be just about as fast.