I'm surprised that the SquadFather was not the first to jump in and call that workout BS. Thank God he has finally arrived with his insightful and famous "BS" analysis.
Anyway, congrats to TWT (if he's serious). People tend to overlook the advantage of doing partial DL's (or most any other partial exercise) for gaining size and power. And at a fairly rapid rate, at that. Sometimes we really do not understand how powerful we really are until put to a maxium test. Getting away from the same old standard way of working out can turbo charge a lot of guy's workout goals.
Might try chalk for DL'ing. The last choice would be rosin/pine tar based stickum. Could tend to tear the palms of some guy's if not used the right way. Set the pins just high enough where the bar is raised a couple of inches. Have a weight about 50lbs more above the weight where you would normally lose or slip a grip. And just hold the bar for 20-30 seconds, or so. Can also use a false grip (thumbs over the bar for extra finger strength). Do these after a regular DL workout. Good luck.