Vanderhoven7, I am glad you posted that document. I thought of posting it more than a week ago but I never got around to doing so. But, your post of the letter has a serious omission of one word (you probably unconsciously made the omission or maybe you had a different source for it).
Part of that document is interesting to me, because the letter doesn't actually claim the person is disassociating from the local congregation nor to claiming to be no longer being one of Jehovah's Witnesses. [Note that instead of the wording of your transcription of the letter, at https://www.4jehovah.org/sample-disassociation-letter/ the letter begins by saying "I have decided not to disassociate myself from the ____________ Congregation of Jehovah’s Witness." Note it says the word "not".] Instead it says the person disagrees "... with certain actions, policies, teachings, and writings contained in publications produced, and oral teachings promulgated either individually or collectively by the Governing Body of Jehovah’s Witnesses and its legal corporations, the Watchtower Bible and Tract Society of New York, Inc. and the Watchtower Bible and Tract Society of Pennsylvania, Inc., and the International Bible Students Association." But in saying the latter the elders would judge the person as being an apostate and probably subject to being disfellowshipped for such instead of being disassociated. If that is the case the letter probably would not work in preventing the person as being announced as "no longer one of Jehovah's Witnesses". But it is interesting the letter makes a distinction between disassociating from the local congregation and disagreeing with the WT on some particulars, since it specifically says "I have decided not to disassociate myself from the ____________ Congregation of Jehovah’s Witness." The word "Witness" should be replaced with the word "Witnesses".
The letter is also very significant since it says "This is also to notify the _____________ Congregation of Jehovah’s
Witnesses that you, nor the Watchtower Bible and Tract Society,
including its over 100 other associated business corporations, have any
authority over me whatsoever." That is important because the WT's handbook for the elders says that if the JW/ex-JW does not recognize the elders as having authority over the person and if the person no longer identifies as a JW the elders have permission to not take action on the person. In the letter, for clarity it would probably be good for "... that you, nor the Watchtower ..." to instead say "... that neither you, nor the Watchtower ...".