Not yet.
It seems like those terraforming builds are messed up a bit:
Grassland/Muddy -> Lush
Marsh -> Muddy
Plains -> Grassland
Scrub/Taiga -> Plains
Tundra -> Tundra
Ice -> Permafrost
Barren -> Rocky
Badland/Desert -> Scrub
Dunes -> Desert
Salt Flats -> Dunes
Lush is best terrain, so there should be 16 other types that can be terraformed.
Grassland, Plains, Barren, Badland, Desert, Scrub, Dunes, Salt Flats, Taiga, Tundra, Ice, Marsh, Muddy is here.
Rocky, Jagged, Permafrost isn't available for terraforming.
So Tundra should be towards Taiga.
And Permafrost should be towards Tundra.
Rocky and Jagged could be added to one terraforming towards some other terrains.
That is:
Barren/Jagged -> Rocky
Tundra -> Taiga
Permafrost -> Tundra (not Tundra -> Tundra)
Plains/Rocky -> Grassland
Toffer, if you are reading this, those improvements serve as terrain limiter for terraforming builds.
For example terraform towards Dunes build action could be done on Salt Flats only.
Fixed it in Github.
Now you can terraform any land terrain to Lush:
Grassland/Muddy -> Lush
Marsh -> Muddy
Plains/Rocky -> Grassland
Scrub/Taiga -> Plains
Tundra -> Taiga
Permafrost -> Tundra
Ice -> Permafrost
Barren/Jagged -> Rocky
Badland/Desert -> Scrub
Dunes -> Desert
Salt Flats -> Dunes
Salt Flats -> Dunes -> Desert -> Scrub -> Plains -> Grassland -> Lush
---Ice -> Permafrost -> Tundra -> Taiga -> Plains -> Grassland -> Lush
-------------------Barren/Jagged -> Rocky -> Plains -> Grassland -> Lush
----------------------------Badland -> Scrub -> Plains -> Grassland -> Lush
------------------------------------------------------------Marsh -> Muddy -> Lush