Don't know if the professor's data is reliable, but I'm willing to bet that for every true story of a hate crime, there are dozens that are lies. This is like Me Too. All these chippies coming out of the woodwork claiming rape 20 or 30 years ago with no proof and ruining some poor guy's life with phony (or at least unprovable) accusations. Do these false accusers realize the damage they do to real victims?
Maybe they do realize, but they don't care...so long as they get whatever they really want out of the accusation (money, fame, whatever).