Who else uses Shlita about tzaddikim who have passed on? Nobody. You guys didn’t either until this stupidity started.
The terms זצ”ל or זי”ע or ע”ה, etc. were perfectly fine, even for Chabad and even referring to your own tzaddikim, e.g. the heiliger Baal Hatanya. Suddenly you start using Shlita for the most recently deceased Rebbe, and you think you can fool us into thinking it’s just a way of saying צדיקים במיתתן נקראים חיים? Well, you haven’t fooled us. Your excuses are hogwash. Stop the stupidity and kefirah, and rejoin klal Yisroel.