At first I was happy someone managed to get g3d since trying old amnesia profiles only got vorpx to hook and show no stereo image of the game.
There are weird artifacts and that thing you mentioned that alternates eyes, especially noticeable while moving, but 3d strength slider does nothing and switching geometry on and off seems not to change anything too.
I know eyes can play tricks on you trying to see stereo in vorpx, where you almost convince yourself its in stereo while its flat. While real 3d jumps at you right away, if its there, its there and there is no doubt. But to make absolutely sure I compared it to vr desktop + reshade z3d for opengl and reshade z3d is noticeable right away compared to this.
So unfortunately I have to conclude this profile (at least for me) has no stereo whatsoever.