It's kinda like old Mentzer stuff. Low rep, low set, forced reps, etc. etc. super high intensity stuff. Some guys seem to do okay with it, some guys need more volume with less intensity to stave off CNS burnout perhaps. Which I think is one of the reasons it does not work great for many. It is not magic, or a magic way to train.
I did that stuff and really did not notice any huge difference from my reg volume/frequency stuff, but I had already been rather advanced and any big gains in BW, were going to come mostly from lots more eating.
I might guess the best approach would be, to do it for say 6 weeks, then go back to a more middle of the road, reg vol and frequency program.
Remember too, these guys were using PEDS, so recovery and or most any type resistance, will produce above any natural outcomes.