I think it's important to note that after the section of the interview quoted at the beginning of this thread, Tissier Sensei talks about how technique "unlocks the body," and allows ki to occur naturally.
Perhaps something is lost in the translation, but to me, Sensei is taking a naturalistic approach to ki, and not making a big deal out of it.
Ok, let's put it this way. It doesn't simply occur "naturally." Not unless you're shown specifically what to develop, how to develop it etc.
If you could do these skills there's no way you would make a statement like that
I remember a friend quoting Abe-sensei in Kyoto who would hint at how to develop it but when pressed on the details would say
"Oh yes there are ways to train it, but they are indeed secret. And its not something I'll tell anyone how to do" yatta yatta yatta
Which is more forthcoming than most Japanese of his age. Most times they won't even tell you that you're missing something