My post from the other thread:
Here is an explanation from Lane Johnson himself. He looks at what he sees from Kelce and leg kicks based on that so it does appear he's moving before the ball because he is, but he's not moving before Kelce starts the snap. If what Kelce does before the ball actually moves is considered part of the snap, similar to the pump of a long snapper before launching the ball between his legs, it's not a false start. I have to think many teams have brought it up and that Johnson has talked to officials himself so he doesn't get called. What's funny is no one talks about how Guards, including Martin, point forward before the snap while set to signal to the Center to snap the ball and that's not considered a false start. Obviously, officials allow that move to benefit the OL. Maybe it's similar with Johnson. Would love to hear a ref weigh in on his move.