The purportions of the different letters are not the same. Your example, the five "wwwww" looks about the same length as four "mmmm". A typewriter would have to have some regulularity, while a computer need not. So this makes sense.
In my test, the "wwwww" is just slightly narrower than the "mmmmm". Completly different than your image.
If your example is correct, I still think the font is hugely different. Which would entirely preclude making a duplicate unless every letter was adjusted to match MS Word.
It's an irrelevant nit-pick, FWIW. Everybody on this thread agrees the documents were not made on that model of typewriter, but not for exactly the reason you gave.
The IBM Executive does proportional type, and could be fitted with special strikers to make the "superscript st." But several paragraphs of text, in the closest of the available fonts, would not match with the precision shown by MS word (yours) vs. the forgery. Therefore, the forgery was produced by MS Word.