It is a full body workout
OK, my vicarious apologies to diesel for not re-reading his program. He does say once per week per body part. The only thing I question is how many sets. Unless I'm reading it wrong, it looks like a 3 hour workout! I've done best with 2 or 3 sets per exercise.
Yes, my weight workout is full-body, once per week. I do other sorts of light exercise throughout the week (drumming, dancing, sometimes a little running, sometimes karate), but I don't find that light stuff causes muscle breakdown if I don't overdo it.
Again, my reason for the full-body workout is that I find it really impossible to isolate muscle groups well enough using as heavy weights as I do. The lower body exercises strain the arms and shoulders just by picking up the weight to do squats or heel raises. If I had a Smith machine that might be different, but all I have is free weights. Muscle breakdown has been a big, big problem for me. That's the relevance to this thread.
Really, the best thing for you to do if you want to bulk up, skinnydart, is experiment. It's not a one size fits all thing. But one thing for certain is that it's important to warm up before working out, and start light and work your way up. Nobody makes much progress if they're always getting injured.