I just watched the video above. I'd say it's a criminally bad design, because the emergency open is completely hidden from the casual observer and completely blending in with the other colors and shapes of the armrest. This makes it useless in an emergency.

There is a reason why Fire extinguishers, seatbelt release buttons, emergency exit signs, emergency brakes in trains etc. are all designed in bright, red stand-out colors with big letters on them.