No, you missed a part of it. The article explained that the Android system aggressively suspends whenever it can(for example it could suspend even when a userspace app is doing some work) and thus it needs suspend blockers to force the system to not suspend. Thus suspend blockers are what makes possible the aggressive suspend capability of the Android system. Even a buggy app won't stop the system from suspending if, at the time, the suspend blocker won't block the suspend.