i.e. you can not claim “Am Haaratzos” when dealing with Yud Gimel Ikrim. (He brings proof from various Rambam’s.) Thus, it needs to be assessed if it falls into the above category.
Why would it?
Those who say the Lubavicher Rebbe is HKB”H (or some form of that) are of course apikorsim, but why would thinking he’s coming to life as moshiach be?