Passive mobs are still spawning

[TheTarasus]

There is my config:

{
  "chunkConstant": 17,
  "rareSpawnTicksToWait": 400,
  "monsterGroup": {
    "capacity": 30,
    "peaceful": false,
    "rare": false,
    "immediateDespawnRange": 128,
    "despawnStartRange": 32
  },
  "creatureGroup": {
    "capacity": 0,
    "peaceful": true,
    "rare": true,
    "immediateDespawnRange": 128,
    "despawnStartRange": 32
  },
  "ambientGroup": {
    "capacity": 0,
    "peaceful": true,
    "rare": false,
    "immediateDespawnRange": 128,
    "despawnStartRange": 32
  },
  "axolotlGroup": {
    "capacity": 5,
    "peaceful": true,
    "rare": false,
    "immediateDespawnRange": 128,
    "despawnStartRange": 32
  },
  "waterCreatureGroup": {
    "capacity": 5,
    "peaceful": true,
    "rare": false,
    "immediateDespawnRange": 128,
    "despawnStartRange": 32
  },
  "waterAmbientGroup": {
    "capacity": 20,
    "peaceful": true,
    "rare": false,
    "immediateDespawnRange": 64,
    "despawnStartRange": 32
  },
  "undergroundWaterGroup": {
    "capacity": 5,
    "peaceful": true,
    "rare": false,
    "immediateDespawnRange": 128,
    "despawnStartRange": 32
  },
  "passivePersistent": false,
  "hostilePersistent": true,
  "ambientPersistent": true,
  "waterPersistent": false,
  "mobSpawnAdditions": [],
  "mobSpawnRemovals": [],
  "overrideSpawnerDefaultValues": true,
  "minSpawnDelay": 200,
  "maxSpawnDelay": 800,
  "spawnCount": 4,
  "maxNearbyEntities": 6,
  "requiredPlayerRange": 16,
  "spawnRange": 4
}

The pigs, chickens, all passive mobs, etc are still spawning. How could I restrict mobs from natural spawn in all biomes?