People here are really using somewhat different semantics to describe the same thing.
Indeed within time and with brainwashing (with so many repetitions) compelling would be possible - as He says too. I explained with his words as far as I can on my previous entry. That was what I have understood, basically
But if I go further; at that point of time, the person in question -the one that you’ve succesfully compelled to kill himself - is no more himself but a living zombie to my understanding, Why ? simply he may not think and he is somehow in a different state of mind “a very very altered mind” ( sorry for my terms) , basically he is no more himself. You somehow kill their brain/instinct with repetitions and if you accept it -this is also a kind of a brute force- and you use that force fully to get the compelling state of mind, and then they may kill themselves.
So in a way, even you do compel them to kill themselves and they are no more themselves and yet even for doing so; you need a good period of time - a lot of repetitions -not like the way that Proffessor X does something implied at the very beginning- That is my understanding from those entries.
What he says make sense. At least it really did to me.