You litvish guys though HAVE TO accept it since this concept is clearly stated in the nefesh hachaim
Ch”v did the Nefesh Hachaim ever say such a thing as “this is Hashem’s essence as He has clothed Himself within a body”.
Nor, if the Rebbe was saying the same as the Nefesh Hachaim, woul he have needed to defend himself against “a shturem” and bring “sources”.