I put "Fi" in quotes, because you said it wasn't Fi itself. And I fail to see how this is not an "odd marriage" between Ti and Fe, exactly how I described it.
Let me paraphrase what you stated.
BlueWing describes the Introverted Feeling of the INTP as a synthesis of Introverted Thinking and Feeling.
That is incorrect.
What I said was the following, when an INTP feels, his Feelings are often directed at his inner life. For example, the INTP may find beauty in a mathematical equation, or some abstract idea. This is very similar to Fi, as for example we notice NFPs display an intense emotional reaction to an abstract idea. We find many examples for this phenomenon in the writings of Kierkegaard and Augustine.
But what actually happens is the Extroverted Feeling is directed towards the inner life and not the Introverted Feeling itself.
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Let me clarify further;
Introverted function: Interposes an internal subjective mindset between the experience and itself.
Extroverted function: Interacts directly with the external world.
Introverted Feeling: Imposes a subtle unconscious agenda of valuation between the object and the psyche itself.
Extroverted Feeling: Emotes directly in relation to the object.
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As I have explained in my ENFJ profile, the Extroverted Feeler often collects the emotion expressed by others, as Jung says, an Extroverted Feeler may call a painting good or beautiful not because it directly pleases his or her aesthetical judgment, but because the present company feels the painting was good or beautiful.
In the case of the INTP, the emotive judgment interacts directly with the object, in my example it is the mathematical equation. If the INTP thinks that the equation is beautiful, the emotional reaction will follow. In the case of an Fi type, Feeling has a mind of its own. The emotive agenda is not directly prescribed by an agent foreign to feeling, it operates by virtue of the aforementioned mystical agenda of unconscious emotive valuation of its own.
Because the INTP does not employ such an agenda, this type is not an Introverted Feeling type.
You stated that I was describing the Introverted Feeling of the INTP, this was not so. I was describing how the faculties of cognition of the INTP resemble Introverted Feeling, but they are not of Introverted Feeling.