I'm too lazy to look for it, but that's what I inferred from the explanation BBs provided when they were trying to convince us SB was an important underused skill; it is to contest more shots even if it doesn't show up as blocks. I've seen it in my players as well that when I move from man-to-man to 3-2 zone, my shot blockers are far more prone to fouling because they are contesting more shots.