Reading between the lines can be more interesting

. Reading Jung's descriptions of the types shows such a bias against Fe & a Te that I have hard time seeing him as Je-aux. His description of Fe is the worst of the 8 & filled with the most bias. He compares Te & Ti in a way that sounds like he's got a chip on his shoulder concerning Ti being just as valid as Te (which is how he describes Ti-dom too - with an inferiority complex).
I think Jung is a Ti-dom, then. His theory focuses less on the auxiliary than "play" between the dominant & inferior though. While most people think the tertiary is the same orientation as the dominant, this was never stated by Jung. Some have suggested the aux & tert are both of the same orientation, which would make distinctions between many types very minor (ie. an IxTP would be very possible). It's possible Jung didn't even think the functions besides the dom & inferior have orientations at all (although that the aux is opposite is implicated pretty clearly to most). In which case, I could see him as simply identifying as a Ti-dom with a preference for iNtuition, without needing to define more than that because perhaps he thought it's not defined that way in a person's psychology. He DID state he had a stronger preference for thinking & intuition than sensing or feeling. That came straight from the man's mouth. Sure, he could get his own type wrong or believe it changes, but that's even less founded speculation than thinking he is Ti-N.
I just don't see him as INFJ, not interviews or in his writing. He writes with a kind of heavy-handedness that sounds more like a Ti-dom than a Ni-dom. I don't see his as an ISTP either, certainly not in MBTI. His outward expression sounds like he extroverts iNtuition to me, not Sensing. So yes, I type him as INTP, or closest to that.