From Russel’s car-cam, you can see that Norris first moves while all lights are on. Probably before he actually leaves his start-box, the lights go out. He stops outside the box, everybody starts and he goes last. I can imagine that the sensors did not catch that as a violation. It is (on F1TV) about 1 movie frame that you can see movement under lights on. Would love to see someone slowly playing it with broad-cast quality. It could have been the fastest start ever if he had continued to drive.