I agree that this angle is dead, however the angle that is over-looked is this:
As a computer engineer, I feel that I probably type as well as the average guy. Now his own wife and son said that he didn't even type.
Now how do you type a letter perfectly formatted with a single typo, no such thing as backspace/delete. No signs of white-out. Nada. Hmmmmmm?
Maybe he had a secretary type it out?