I don’t have a thinking with rep ranges. Any range can provide hypertrophy. Heck even sets of 100 reps (or more) can have benefit.
Paul’s technique is in line with recent a scientific finding showing that as long as you reach muscle failure, the amount of hypertrophy stimulated will be the same. In that study they compared 3 sets to failure at 30% and 3 sets of failure at 80% and both gave similar results for muscle growth (80% being superior for strength gains).
And if you use progressive overload, it will work. Meaning that if you get stronger over time, even in higher rep ranges, your muscles will get bigger. You don’t have to increase your 1RM to increase strength.
Paul’s approach uses a double progression (add reps with a weight until you achieve a certain number, then add weight). So it will work.
It has a lot to do with individual preferences. If someone hates doing high reps, he likely won’t get much out of them because he won’t be motivated and will likely subconsciously give a less than maximal effort… just like if some hates low reps he won’t get optional results because of too much anxiety or low motivation.
In my own training I do use high rep sets for one exercise.For example, at the moment I’m training at a “bro gym” and the dumbbells don’t go super heavy. So I’m simply trying to beat my total rep record over 3 sets from week to week. If I can increase from 50 total reps over 3 sets to 60, then I got stronger and stimulated growth.