If Boghossian was using university resources or their letterhead for the fake submission, the university probably has a case for reprimand or firing.
On what grounds is there a case for firing him? University faculty are generally allowed to submit their work for publication in academic journals without any oversight and clearance by administration - in fact, I would guess that most have explicit statements to this effect in the name of academic and intellectual freedom. If Boghossian's colleagues are permitted to publish meaningless post-modern mumbo-jumbo and racial grievance rants masquerading as scholarship, he is equally entitled to write papers that expose those works of pseudo-scholarship as intellectual fraud.