Trying To Make a Custom Dimension Without Structures

As the title says, I'm trying to make a custom dimension without structures, a superflat dimension for a map I'm making, I've got a code that an AI gave me since I'm no good at coding myself TwT. But I'm not sure why it still generates structures:

{
  "type": "minecraft:overworld",
  "generator": {
    "type": "minecraft:flat",
    "settings": {
      "layers": [
        { "block": "minecraft:bedrock", "height": 1 },
        { "block": "minecraft:dirt", "height": 200 },
        { "block": "minecraft:grass_block", "height": 1 }
      ],
      "biome": "minecraft:plains",
      "structures": {
        "structures": {}
      }
    }
  }
}