No, the idea is that the AI box is fundamentally flawed. I believe he defends engineering the AI with fundamental safety, s.t. no box is required.
Personally, I think we'd need a much more intelligent and complex AI for the capability of breaking free of the box and even possessing the "desire" than we're getting for the foreseeable future (it considers a motivated AI of almost limitless knowledge about the world and cleverness), so this thought experiment may not be so relevant. I agree with him the boxing approach is not a robust one though.
Personally, I think we'd need a much more intelligent and complex AI for the capability of breaking free of the box and even possessing the "desire" than we're getting for the foreseeable future (it considers a motivated AI of almost limitless knowledge about the world and cleverness), so this thought experiment may not be so relevant. I agree with him the boxing approach is not a robust one though.