I gave the demo a try just now, and after trying all 4 dx12 profiles, Death Stranding seemed to be the only one with functioning Z3D. However due to the very low fov in the demo the 3D effect is very subtle, even at maximum strength.
There doesn’t seem to be any way to increase fov in the demo, but hopefully the full release will.
No mention of dx11 support to come for RE8, which is a shame. RE7 G3D was quite a treat.