"Mr. Heilman maintained that Lubavitcher accounts can’t be trusted because they are hagiographies and said that he and Mr. Friedman did not examine the rebbe’s extensive writings on scripture because they were interested in his personal history, not his scholarship."
(Review - here)
An idiotic statement to put it mildly. Personal biography can hardly be divorced from scholarly writings. Many biographies are largely based on scholarly writings. It is largely in such writings that we can see the thought process of the subject and track their interests, ideals and beliefs.
PS - An interesting thread concerning one of the topics under debate (the Rebbe's Semicha from the Rogatchover) can be found here.