Omg..I thought, I answered you - I'm so sorry...here is my (very late) answer:
I can Confirm, that no AI is involved...these Scenes are made in a 3D-Engine and then the screenshots were overpainted with Krita...So these Backgrounds are no classic "Paintings" from scratch but I worked with the digital pen by myself (and thats the secret, why it takes so long to create updates for this)