I follow everything and something is wrong it not a egg sphere help
The formula looks correct, but you've added it to "textureFormula". You want to modify the terrain, not the texture. You have to add it to the "terrainFormulaDifficulties" parameter right before.
Be careful to the syntax because now it's per level of difficulty. You can take inspiration from the planets from the example folder:
Try this and don't hesitate to tell me if you still have a problem.