I went in creative just to do those shots because I didn't want to worry about my jetpack derping up and down, just wanted a nice screenyThe third screen shot hes has the GUI showing and it is clear he is in creative mode during that screen shot. Not out right suggesting it done it creative but it is made more suggestive that there are torches everywhere but he has a full stack of 64 on his bar.
Now it in vary possible he went into creative for the outside shots instead of using a jet pack and did not charge while making the the indoor screen shots.
Weather this is true or not is not really my place to judge. People play how they want to play and a nice build is still a nice build at the end of the day.