Dark Aristokrat
Plo Koon Rulez!
Being stripped from the force and having the force removed from your body are two different things.
Actually, in Ulic's case he still had the force, he was just barred from feeling it properly. But in the case of what Traya, the Exile, and Nihilus does is literally rip the Force from one's body. And since the force is tied to life, they die. Simple.
Glentract there could very well be no defense against that technique becuase only Nihilus and the Exile really controlled it, those two created the technique.
Actually, this is debatable. While it's evident that Nihilus mastered the technique due to his unusual nature, there is no instance of him creating it. If anything, Kreia calls it an ancient Sith technique, that he is in personification, the pinnacle of.
If Kreia was able to do it on her own later on she would still have learned it through Nihilus and the Exile. This is made very clear in Kotor II
No, it isn't made clear in KOTOR II cuz you're wrong. Kreia never says she learned the technique through either of them. Indeed, the Exile is confused when he/she first uses it whereas Kreia is guiding them through the proper use of it.