Most towns in NT have an AMP (alcohol management program) in place, presumably for good reason. As for who legislated it, most likely the NT licensing Commission ratified it (remember this is a territory and not a state, so much governance is by decree unlike in the states). I doubt that any of what you describe was related to the resort management, rather it was NT regulations being ever so quaint. And despite these restrictions on alcohol, consumption is still double per adult compared to the rest of Australia.