So, yesterday I was too hasty to close the thread, thinking that GBX has simply reverted the change. But it’s MORE than that. The hotfix has boosted the Deathmark to 80%, it’s even in the description. So, now you can melee a target once, and it will be debuffed to 80% 
Also, although Zero throws 4 Kunai at once, you’d needed to be pretty close to the target to get full 80% debuff. Now, even a sniper Zero can get 80% debuff, by landing a single Kunai across the map.
You can thank @khimerakiller for spotting it, and @Derch for pointing it out 
Gearbox, stop being so awesome, I want to play Fallout 4! 

