Hi, thank you for getting in touch!
Most of the terrains were mapped manually. The top part of cliffs were mapped first, using terrain autotiles. The bottom part was mapped later, in a bottom layer.
We apologize but at this time, the MT Terrains does not come with auto map rules for hills, only brush for the terrains.
If you find this asset to be of no use to you due to this, please contact Itch customer support and request a refund for this purchase and we'll gladly approve the refund request.