n0mesorah,
Additionally, you seem to be ????? in the word “Rejoicing of Rashbi” in the Rebbe’s letter.
This was not the Rebbe’s words (it’s a translation). The Rebbe wrote “?????? ????”?” – which he always uses to describe passing. The yahrzeits of the Chabad rabbeim are often referred to as ??? ??????.
This is taken from the term which the Zohar uses about the passing of Rashbi: ??????? ??????? ???? ????? (Zohar Idrah Zutah 296b).