I'm skeptical of this. The idea that life under the Tau is no better than Imperial rule is difficult to reconcile with a number of human worlds that apparently defected to their side voluntarily, even running a significant risk of Imperial reprisals. Or that the Kroot still get to practice their peculiar cannabalistic shamanic rituals, despite official disapproval of the practice. Sure, their mindset has some
unfortunate implications on a par with Star Trek Cardassians, but (to my knowledge) there's very little evidence for systematic brutality on a par with the Imperium. Like Gol Dukat, they could go either way.