Dear Avira,
I linked to that Gemara. It’s a source that nevuah is not heaven sent words.
The newer parts of Eitz Chaim describe the methods to attain prophecy. These methods come from yidden who claimed to have attained prophecy in the last thousand years. These original writings were published only recently. Your yeshiva may have a copy. Check the Kabbala section.
I am not claiming the Rebbe had anything to do with prophecy. It is irrelevant to the sugya. For those who go by Torah Sources and not superficial-my-teacher-told-me, there is no end of nevuah. And chas v’shalom to even believe such a thing. Nevuah is less common and less authentic then it was in the times of Tanach.