The videos show that you can get to a point of equilibrium where forward speed, steering angle, gravity and centrifugal force are all balanced. I guarantee you those guys had to countersteer to lean the bike over to get to that point. The second video starts with the guys left hand on the bars. Why is his hand on the bars? It's on the bars to countersteer to that point of equilibrium. Once there he uses the rear brake to juggle between gravity and centrifugal force.