That's not true. Under London Breed, San Francisco has accelerated the rollout of safe bike lanes using the "quick build" program (https://www.sfmta.com/vision-zero-quick-build-projects). Ask any cyclist in SF - in the past 18 months the number of dedicated, curb or parking separated bike lanes, bulbouts, signals, and other bike infrastructure has jumped. There are still tons of problem areas (try biking from Bayview to the Mission) but London Breed's administration has already built more cycling infra than Ed Lee's ever did.