Having played about with bamboo bundle bows a little, and making a few self bows, the question I always want to ask when presented with anything about a "survival bow" such as that is "Why?". What situation is imagined that actually calls for such a device? It seems sadly crude if you are planning on long term living on the proceeds of bow and arrow, and an unnecessary expenditure of energy if you are in a real survival situation.
I enjoyed playing with my bows to be sure, but I never really saw building them as a survival skill. Shooting them, maybe, not for me, but for some people it could be.
The principal is OK, but his methods are off.
If he took a bit longer to make it and preloaded the limbs, like you would with a normal bow, he would get a lot more poundae pull out of the bow and therefore greater range and killing power
50lb!Then the hard part is making a 'survival' string if you have nothing on you already. Paracord may work in a pinch but would make a sluggish bow due to the weight and stretch. For a 50lb bow I would want a 200lb minimum break strain string and quite a feat with stuff you find in the woods while keeping the mass down to OK levels. 100lb may be OK for a few shots but would break quick..