You're right. The mouth movement was awful. I have no idea what OP is on about saying it was good. Maybe my uncanny valley is also steep, but nothing about this demo struck me as good.
The tech maybe is good, but I wouldn't know it from this video. The animation and lighting are just awful.
Link in the OP states screen space global illumination was used, which is probably why the part where the character descends below the surface seems really fake. Still very behind Unreal Engine unfortunately, which already supports ray traced "real" global illumination.
The tech maybe is good, but I wouldn't know it from this video. The animation and lighting are just awful.