I think Rainbow has hit the nail on the head. From the video the speed is so much higher than the first landing aircraft that I struggle to believe that he had any retardation.
With the No 2 locked out, if he had selected reverse and then changed his mind and decided to go around, I assume you would immediately get thrust on the No 2 engine whilst No 1 is still in reverse. (I know you mustn't make a go around decision after you've selected reverse thrust)
I'm not an Airbus pilot, can you move the thrust levers out of reverse before the reverse doors are closed, or is there some kind of lock?