GPAA demo (Geometric Post-processing Anti-Aliasing)

So, I was playing Lego Batman 2(Excellent game, BTW), and decided to check out the config file for it. I found the following:

FileVersion 5
ScreenWidth 1600
ScreenHeight 900
WindowWidth 1280
WindowHeight 720
WindowLeft -1
WindowTop -1
ScreenRefreshRate 60
VerticalSync 1
AspectRatio 1
FSAA 0
ShaderQuality 2
ShadowQuality 3
TextureQuality 1
SoftParticles 1
Brightness 10.000000
SFXVolume 7
MusicVolume 7
MasterVolume 10
MusicEnabled 1
SubtitlesEnabled 1
MouseSensitivity 10
InvertY 0
Vibration 0
BloomEnabled 1
ExposureControlEnabled 1
DoFEnabled 1
SoftShadowsEnabled 0
SpeedBlurEnabled 1
MotionBlurEnabled 1
ProcessColourEnabled 1
WaterDistortionEnabled 1
EdgeAAEnabled 0
GPAAEnabled 1
SSAOEnabled 0
RingEffectEnabled 1
LensFilterEnabled 1
ScreenSpaceReflectionsEnabled 1
UseHires 1
UseHiresPending 1
ForceMultithreadedD3D 0
IgnoreVendorPresets 0
DisableShaderCaching 0
DisableMultithreadedShaders 0
AllowVendorExtensions 1

The most relevant portion is bolded. ;)
 
I had to download the demo and see if it was indeed using GPAA. I took a PIX capture of it, and unfortunately I see no evidence of GPAA being applied. Without FSAA enabled in the menu everything looks jagged. With it enabled there's some sort of crude "Edge AA" effect applied, but this is done through a fullscreen pass. In the frames I captured the game never drew a single line primitive. If the game is indeed using it, and that option is not just a remnant from some prototyping, then I suppose it's only used for some specific geometry somewhere.
 
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