apushatayid, The letter is available at identifyingchabad.org, along with gil student’s website. Whether or not you understand it, the psak remains- the newsletter shows much of chabad is michutz lamachaneh. To get back into the machaneh, just remove the word shlit”a and stop saying yechi. The ball is in Chabad’s court.
The letter makes a chiluk between saying the rebbe is dead and moshiach and alive.