I can get down with that. So does that mean INTPs are least in touch with said inner core?
No, because traditional function order is full of s***. I've worn myself out explaining that, so It'll be a while before I have the energy to do it again.
And I would say I am in touch with the concept of Fi as we're currently defining it. It's just usually overridden by Thinking. Sometimes, unintentionally (Such as if principles are violated) or intentionally (Such as if I'm composing), it comes out of the woodwork and I exploit it.
Since I can put myself into an "F state" to create art, I really think it's a fool's errand to type people based on their lyrics, or paintings, or films, etcetera. Though occasionally I will recognize someone else's style as "probably INTP."