Animations are from others creators, such as motherlodesims, E404P, lupobianco, Atrois... and maybe Khlas since he does gay stuff.
The sounds can be made with blender or another program after the video is rendered. The lighting is from blender.
I'd say everything is from blender, he or she just extracted the models from the game and the animations from the animators package. Blender use its own engine, not the game's. You can create a fully animated video with blender. I think his/her work is only about the lighting, camera, angles, story, since the animations are not made by him/her.