It looks like they’re doing what star citizen does with terrain generation where they hand-make tiles of landforms like mountains/cliffs, hills, etc, then the procedural generation takes over and stitches them all together in ways that “make sense.” So it’s not 100% hand crafted, but it’s also not “strange landform” NMS type nonsense that is entirely made from maths so you only seem to get rounded features. From what I’ve seen the environments look absolutely stunning! As someone who plays NMS too I can say they look 100x better than NMS.