He's trained other people this way. I prefer the best of both worlds, brief workouts with as much volume as possible. High Density Training.
His methods are standard stuff.
One thing...he says "only train each muscle group once per week or you will overtrain."
Nothing novel about that except you are hitting triceps and biceps a couple times a week because of chest and shoulder pressing and back pulling + arm days. For some magical reason your bis and tris never overtrain.
Heck, you are hitting the delts multiple times also.
Something doesn't add up, Dr. Josic.
There is an opinion that training a muscle group once a week only works for steroid users because the drugs maintain a constant state of anabolism. Without the drugs this does not happen and more frequent training is needed.
Serge Nubret was a massive steroid user so his routines are absurd for natties.
Regarding high density training (more and more work in less and less time), studies have indicated rest times between sets for optimal hypertrophy are about 3 minutes.
3 minutes between sets. Interesting.
This would make high density training suboptimal for hypertrophy.
Good for aerobic capacity.
Just food for thought.