The New York Times reporters who investigated this wrote in their article: " the posts included a reference to his birthday. In addition, the username on the account, “Exarr,” matches an email address for Bryan Kohberger that appeared in a 2009 leak of accounts from an online payment company; that account listed his location as Effort, Pa., the place where Mr. Kohberger grew up. Some of the posts also contained details that friends said matched their recollections of his behavior and struggles at the time."
unlocked version of article posted by one of the reporters:
Messages and online posts from the Ph.D. student now charged with four murders show that he was once detached and suicidal before he became fascinated with criminals’ minds.
www.nytimes.com