Stereo vision gives 3D for every animal.
That's not entirely how 3D vision and Depth perception works,
If one eye is enough weaker (almost no-one has matched eyes), then pure stereo vision doesn't work. I.e. if one eye sees box and other eye sees animal, with perfect stereo vision the animal is in the box.
It doesn't work for significant number of people.
Also REAL 3D has depth. The eyes focus at different distances according to the object. With FLAT Stereo vision that doesn't work. You get a headache.
So not only is this not going to work for some people, as even Active shutter doesn't work (which is surprising, I thought active shutter might work for slightly "lazy eye", but apparently doesn't)
But it's horribly complicated and not really an original idea.
The guy is wearing Stereo goggles obviously