Hm, I would have expected them to be minimally edited. Lots of misspellings, typos, and weird grammar. I know you want it to be authentic, but that doesn't preclude basic editing.
Editing a farewell message would be the most un-classy thing one could do. Authenticity is worth far more than any spell checked version in a case like this and I'm really happy that they didn't fall for that trap.
Think about it, if there had been no spelling errors or typos or grammar errors, the whole thing would not only have looked perfect, it would have looked perfectly faked. Real life isn't perfect.
I thought it was interesting that Apple, who is usually so finicky about things being just so, apparently didn't filter or edit this data set.
To me, it took away from the experience, and kind of muddled the emotion I expect Apple - and the original authors - were trying to convey. I think it would have resonated more with me if it was a little cleaned up.