I'm pretty sure they're doing 2D image generation. Just look at the way it outlines some of the pieces.
No, it's 3D. It's some kind of automatic background removal. You can see this falling apart in my comment: https://news.ycombinator.com/item?id=42252127
That "outline" is just an artifact of less-than-perfect removal. Here's another one: https://imgur.com/a/zTQubPb
3D in what sense? You think they're doing actual mesh generation?
Misunderstood your comment. It is 2D as you've said, my above being evidence of that.