1- The dangerous vehicle here is clearly the car, not the bike. You literally made a point in favor of bikes. Also next point would make this scenario basically imposible.
2- The claim was worded as "significantly less likely to kill or even injure", which is factually correct, even with cars into the ecuation. If two cars collide at a high speed, there's a lot more energy in the crash than if a car and a bike collide. I've had quite a few accidents with a bike, some of them including cars and pedestrians, only once I got actually injured on an arm.
This has happened to me so many times I feel like a fucking moron each time because I don't learn the lesson. I was thinking some depressive shit a few minutes ago, this was a great reminder