Thanks! I was actually looking at info on Dutch process vs natural again today and came to the same conclusion. I was just going to tell OP and saw you told me the same yesterday :)
@GardenGeek@europe.pub, the recipe is probably designed for Dutch process coca powder. Natural is acidic (low Ph), so it generally gets paired with baking soda (high Ph) to produce leavening. Dutch process ph neutral, so it gets paired with baking powder which leaven’s on its own.