but look at the load being used. they are 50-70% for most of the excercises. this is not much of a load,and shouldnt be too demanding. I did the squat routine from t-nation. squats 2x a day. the morning was 30%,and night was 50% of 1rm. then 2x a week, the intensity was 80-85% for a workout.
The intensity is less than hitting your large body parts 2-3 times a week like in dc, westside,5x5, and many others.
If your shoulders are a weak point,it would be something to hit on. you are only as strong as your weakest link.
I wouldnt do flat bench on this, but try floor presses,or incline. I dont do flat bench because it messes with my shoulder.
Some people use a 4-5 day muscle split, this could work in that sort of setup.

That's a good point. I skimmed over the lighter load part, but I'd still be too sore from such a high volume that my chest and triceps would get robbed of a good workout. I was also going by what BradG stated.
To me that's a good indicator that maybe it's too much if it interferes with all your other muscles.

Plus, from my own experience, doing high volume with a hugely submaximal load such as 50% gives me only a good pump and DOMS for days. Unless you're doing a SD like in HST, I don't see lifting 50% of anything being productive IMO.