Yes. It is a model and a shader so it should work in commercial version too. It really has nothing to do with 3dgs terrains.
Captured scene takes around 0.3ms to render on a NvidiaGTX660 but it computes pixel normals in real time so backed normals will speed it up a lot, I guess.
Next step is to generate some tiled nm+hm in order to build an infinite system but L3DT does not finish the process after hours of computations Does somebody know any other free program with erosion and so?