You're right. He accuses them of not caring about him, they assure him that they do care about him. They offer him a break and a sandwich.
This is not anyone's idea of what a military interrogation looks like. Hollywood could not write this script.
Whatever the kid's lawyers are trying to make of this, its not working. It shows the very opposite of what they are trying to claim.
It shows army interrogators treating the kid with deference and respect, and even some affection. He clearly feels at ease and safe with them.
That is, he is complaining about American treatment, but the interrogation in the video is by Canadian agents. The Canadian court forced the release.