I slightly disagree with this analysis.
The rider (red jacket) in front of the cameraman greased it, moving onto the center line, to pass the rider in front of him. Red was focused on his pass and not the rigjt hander he was about to enter. Red entered the curve too hot and by the time (perception-response) he reacted, he chose to brake rather than lean and went way wide (even though he had plenty lean angle he coulda/shoulda used. His hard braking kept him upright and straigt. He was fortunate to have the distance to slow enough to regain control and avoid the guard rail.
Now the camera rider. He, focused on all the actions of Red and he also was surprised by the curve. He was a far less skilled riderthan Red and by the time he reacted, he froze and rode straight into the guard rail.