I wonder if there is any impact on where the pressure is applied to open and close the phone. I think back to my flip phone days and I would flip it open using my thumb along the side, putting pressure across the hinge. In the testing video the pressure to open the phone is at the top, so no twisting pressure on the hinge (and in this case the lense).
Also when I closed the phones I would sort of snap it closed where the testing machine shows it gently guiding it closed. I'm not trying to be a wise ass, just giving my impressions from the video.