Updated June 15, 2019
The Federal Aviation Authority mandated that airports install long runway sections comprised of a material* that stops planes in trouble. The use of the new runway configurations began in 2014 or 2015. Perhaps there was a change in jet blast barriers (type and position) during and after this project?
*Engineered Material Arresting System - In SFO's case, possibly 4-foot square blocks of crushable concrete aggregate filled with foam
Above image - date unknown
Since SFO repeatedly rejected my requests to talk with someone who was knowledgeable about the airport's runway changes, the following is conjecture.
Guess #1: Planes on the runways that face Oakland now start their "run up" (with the brakes on) 400 feet farther away from the highway before they start their "takeoff roll". Perhaps the sound barriers that diverted the "back blast" noise up until the end of 2015/beginning of 2016 were replaced with a different back blast barrier that's no longer diverting the noise? Perhaps NO back blast barriers were re-instated since the jets are now 400 feet away from the Bayshore?
Note: airports rarely use the term "sound barriers".