I have seen that video in the past and its the reason why I dont say anything when people say "Burms are heavier-bodied than Retics"....in general that statement is true, especially when youre talking about dwarf line retics, but mainland retics can get ENORMOUS.
I would still argue that a properly (not overly) fed male Burm is handleable by an able-bodied, strong person alone. Female? Thats pushing it.
I had a 9ft BCC female years ago that weighed 85lbs and I had no problems with her alone, a male Burm isnt very far from that.