I did not see the video.
However, as far as using 8 or 6 shot? It all depends on how close you are. I have cut a squirrel in half a 15 ft. (He jumped.) Most rooms are not 15 feet. Think about having a full choke, at say 8 feet from the end of the barrel to the wall? 8 would probably have less effect after the dry wall. I still keep 6 around the house for HD. At least I am not going to take out the neighbors with 00. Make your self a box 16" by maybe 30 with dry wall on both sides and shoot a couple of shots at close range to see what happens.