There are several errors contained in that 2 page letter. Remember, the Watchtower is out for Reddit's blood, and sending out a "bait" announcement letter would make for a good set-up.
Notice the word Salve....instead of Slave
Notice the comma after....April 1st, on both pages. See the difference?
Notice the space between some of the words that are of importance.
If the letter is real, then it was done in haste without proof reading or spell checking, and is just a typed copy. Not something normal for the Watchtower.
I would use "caution" concerning that letter, and I would certainly NOT post it anywhere.
Atlantis!