When you lift a submaximal load for many many reps you recruit the SLOW twitch fibers and thus result in Sarcoplasmic hypertrophy.... however when you use 90% or more of your percived 1rep MAX you RECRUIT the FAST TWITCH fibers which result in Sarcomere hypertrophy... most responsibly for muscle growth and myogenic tone.
For best results always cycle HEAVY loads in your training.
While your statement may be correct, it shows that you completely misunderstand Milos’s training method.
It is not doing sub-maximal load for many reps.
On the first exercise you train to max for approximately 10 reps, your rest 5 to 10 seconds while getting into place for the next exercise which is the maximum load at THAT time.
Since you have been pre-exhausted by the first exercise, you then proceed to each exercise repeating the process training with the maximum load at THAT time, each time.
The shoulder exercise that everyone like to make fun of is a leverage movement and not a press. It is done as the 7th exercise in a giant set.
At my gym I took three guys who are all capable of doing seated front presses with 225 pounds for 8 reps and had them do this Milos shoulder exercise, with NO pre-exhaustion exercises. None of them could get 10 reps with a pair of 5 pound dumbbells.