The tournament is played on 200% difficulty,
But this isn't specified in the rules. It should be included because it's important. It will simply extend the game.
On this map, nomads are placed at every turn, presumably to make it easier to traverse the sands. But why are they needed on this map if it contradicts the rules?! Should players refuse to join them? They can, but it would be simpler to remove them altogether, because movement across the sand is already easy, and now they have to spend their turns on this oversight (whether it's in the rules or on the map).
Definitely, the rules imply that nomads should join. It's just necessary to discuss this in the rules for this map. I think the players can easily agree on everything before the match, but it's better to include it in the rules.