Nope, that's not true. I use exactly this nut and an impact wrench for removing the clutch assembly. Just hold the clutch while pressing with the fingers onto the clutch plates. Worked everytime I did it this way, no special tools, no problem.
You need some special locking tool if you want to re-torque the nut when putting everything back together (the Ducati tool is basically a plate with a couple of holes in it). Or do it like I do: use impact wrench and give it two shots, with locktite on the hex nut. Learned this from a Moto2 master tech.
Alternatively engage the highest gear and step on the rear brake while somebody else is torqueing the nut. I did it this way for the STM dry clutch.