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That really should be “number of hard sets”. You can make a set hard in a number of different ways: shorter pauses between them, higher rep count, higher weight, slower eccentric, utilizing greater range of motion, you name it. If a set is not at least challenging, it is probably what some call “junk volume”.
Also, where powerlifters are concerned, you should probably differentiate between on- and off-season training. When a powerlifter is not “peaking”, they will usually do more hypertrophy work: moving big weights requires one to utilize many of ones muscle fibers simultaneously, and also to properly brace, both things one has to train for specifically. But all of that is no use if one does not have the muscle mass to make it happen :)
Oh… is Reddit still around?