Both videos were interesting and it's too bad that others can't play them.
It's hard to imagine an ape that is 12 feet high that can get enough protein by eating ants that infested a stick as shown on the film. Maybe there is enough protein or special minerals required to remain healthy. Gigantopthecus was probably a plant eater unlike some of Africa's primates. I wonder if it deevolved and became smaller over time and transformed into the present day African gorilla as this film depicted.