I don't believe these are real. I believe they're forged, for a large number of reasons, including the ones you cited. Even stipuling he was putting a 'CYA' on paper, he wouldn't change the ball on the typewriter in order to get superscripted 'th'. However, I believe they were forged on an IBM Executive typewriter or similar, not a word processor. We've still got a couple of these around here.
As I said elsewhere, it's a question of whether they are obvious forgeries, or ludicrously amateurish obvious forgeries. But if you let them demonstrate they're typewritten, and you've based your entire case on the premise they' re word-processed, then they can claim you're discredited.
Point.