I would estimate the list to starboard to be between 7° to 10°. This is well outside the acceptable limits for a cellular container vessel of her size. This alone should not have caused the stacks to topple unless there was acceleration in the vessel’s movement . I very much doubt that the ship was anything other than upright when she first came alongside. What happened to cause the list as very few boxes have been discharged looking at the video.
In the video it is difficult to tell if the ship moved much and the initial cause maybe that the list was enough to cause a container collapse in the after stack precipitating a domino effect.
The longest lashing bars used are about the limit of weight and length that a reasonably fit young man can handle.