Ugh, drivel. Even people in high-reputation positions can, and do, spout nonsense. There are many risks when bicycling, including motorists treating bicyclists even worse on average when they wear helmets. But when when the head hits the road, a helmet substantially reduces the likelihood of traumatic brain injury (TBI). Just like crumple zones in cars substantially reduce auto-accident-related injuries.

Been there, done that, got a crushed helmet and concussion rather than a life-altering TBI or death.