Yeah, that does make sense. Since tourism is linked to culture and it needs to be available to everyone so that the 'ideology' fight can occur, every ideology needs some advantages to tourism. Which then basically means that the other three victories are not present in one of the ideologies, so Autocracy: No Science Victory, and Freedom and Order with no Domination or Diplomatic advantages.
After thinking about it throughout the day i can honestly say i agree with you. They did state originally in a interview that all Ideals had a separate style of cultural victory you could perform. Also currently the only policy group of the 3 that primarily focuses on military is Autocracy. Also, i realized that if Order does not have significant ways of generating culture to defend their ideals then ultimately that makes Order the weakest of the ordeals and the easiest to render moot if you force them to change. Of course this is all speculation in the end but i can say i at least think all 3 will have means of generating Tourism/Culture. Maybe Order will lose out on Diplomacy so they dont have similar strengths to Freedom. It would actually make sense that Autocracy would be good at diplo if they showed it in the form of them interacting with city states by aggressively converting or fearing them into helping them become the leader of the world.
https://www.youtube.com/watch?v=htFD1jlZwyw
4:50+ He even discusses the focus of how a Order civ could go about winning culturally.
Freedom probably lacks Military Bonuses, Order lacks City State/Diplo Bonuses, And Autocracy lacks Science due to their narrow focus on military and not much else. BNW actually gives more incentive for a military civ to keep city states alive and on their side for late game when very few others will have their back diplomatically.
Leaving Culture as the central struggle so that all ideals can equally defend themselves and giving each ideal their own unique strengths.