Actually I said to include the short range DL's with the partials from the knee area, off a rack. It is not meant to be a stand along exercise. Meant to be part of a whole back workout (basic three level lifting positions in a proper workout plan).And yes, great benefit can be obtained from most short range movements. Even from 2" to 4" travel. Most guy's will use a 100 to 150 above the regular DL, from that top short pin position. It builds a base of power and can increase muscle mass. Remember that the DL is primarily a holding exercise, while the legs become the main driving force. Static or holding movements have value in building all over power.You will probably need straps and/or chalk. You will build heavy callouses with straps or not. You will never know the true potential of how strong the body is until experimenting with short range movements, from time to time. Though this very intense type of training may not be meant for everyone.
I would doubt that not too many guy's who come to this site are familiar with partial/rack training. This need not be low reps (2's or 3's). With a higher rep BB'ing scheme (8-12) it can be a muscle builder . Some guy's use 15- 20 reps in some of the heavier compound movements. Is rack/partial training the only way to train? No, it's just a part of many tools offered to become bigger and stronger. Probably best to cycle (6to 8 weeks) partial training from time to time. Rather than pretty much doing the same old stuff, time after time, with slow to meager results. Be warned that it should be approached slowly at first. Getting the CNS adjusted to extreme weights handled should be the main concern. Good luck.