You didn't understand what I wrote, so I'll re-phrase it. The study was from 2015 featuring data from 2002-2014. There have been others with more up-to-date data.
Three point offense is critical. You are right. Three point defense as it pertains to the opposing offense's shooting percentage from 3 is mostly not under a team's control. Teams can control to some extent the NUMBER of 3 point attempts an opposing offense takes (by being in zone, or aggressive pushed up man, or by having a packed in paint and strong rim protector, etc.), but have much less control on how often the other team make those attempts no matter how many that ends up being. Hurley's D does prioritize lowering opposing team 3 point attempts.
But 3pt% D has been tested multiple ways: In-season consistency (first half of the year vs. 2nd half of the year shooting %'s), one year to the next with the same coach, offensive vs. defense control influence, etc. All show that three point shooting % defense to be mostly random and much more influenced by the opposing team's skill. Aka you can contest as much as you want, but Markus Howard or Shabazz Napier or a random guy who is totally in the zone is still making that 3 40+% of the time.
Why is this? Well you can contest the shot, but that's about it. At best this is an inconvenience to the shooter and does not lower the % THAT much, depending on the distance at time of shot. You can't really block 3 pointers unless you're Giannis or Zion, and there's not really much help defense on 3 point attempts that might dramatically lower the %. Jump shooters are incredibly protected by the rules of the game from disturbance and fouling a 3 point shooter is actually worse than giving up a dunk, so defenders are incentivized to not overly contest.