According to TFA, even the guy's lawyer is asserting that the loss of tenure was an indirect consequence of the anonymous campaign:
Sarkar was a tenured researcher at Wayne State University.
He applied for, and initially received, an offer from University of Mississippi Medical Center. In order to take that job, he resigned his position at Wayne State.
Before his new job started, they revoked the offer. His lawyer says that the revocation was clearly a result of the anonymous campaign against him.
Wayne State allowed him to un-resign; but not to grant him tenure again.
My understanding is that actually being stripped of tenure is a much, much, bigger deal, one that would take some nice evidence of malpractice or some very, very, ugly togetherness issues with a substantial portion of the faculty and administration. In this case, he never actually lost tenure anywhere; but resigned it and then was unable to get it back when his other job fell through. Similar end result; but very different process.