Hard to tell but from the videos and the described toolchain it sounds like the video is actually completely 2D and they're just presenting it inside a 'hologra

Hard to tell but from the videos and the described toolchain it sounds like the video is actually completely 2D and they're just presenting it inside a 'holographic' environment. Think of it like a model theatre with a Pepper's Ghost illusion in the middle, except with some fancypants optics to make the display actually be much thinner than the 'theatre' insde.