inability to feel b'nusach Brunoy

On the subject of. mentalblog.com: tzimtzum k'pshuto. How could the Rebbe be so mistaken and assume that GRO held that the tzimtzum is in the Maor?

Perhaps in the past Chasidim encountered many Misnagdim who were disconnected from their emotions. Therefore Chasidim assumed that the Misnagdim could not mamshich sechel in middos. And it has to be because they are stupid and exhibit clear signs of tzimtzum in the maor. In come Reb Nissan and his talmidim and turn this logic upside down. They invent bittul k'pshuto and propose that the middos are no functioning because they are overwhelmed by the hashpoah from sechel. How cute? All this just to excuse, explain and promote the inability to feel?