Toi-
just setting the record straight on 2 points-
first of all, Lubavitchers never skip tachanun on yartzeiten, so …
second, that maiseh is rather questionable considering that the Brisker rov used to figure in it, now it’s Rav Shach. that’s what irks me so much. do we really need to say that Rav Shach knew he was against the Rebbe by glancing at his maamer? c’mon, just stick with the simple fact: he was against the Rebbe ideologically