(SOLVED!) How to get outline meshes to work in Blender

[ToxicCaves]

The fact that it goes invisible in render suggests you have to disable a box somewhere which always turns faces forward in renders (which defeats the purpose of having them strategically face backward). Unfortunately I don't know where this box is or what it might be called.

Fixed it!!! The issue was actually in the nodes; the ones in that link were a bit extra. I instead found this and it worked just like that. I feel silly, but glad it's taken care of! And I wouldn't have googled the right question hadn't it been for these responses, so thanks! 

Flip normals -> i dont actually have to use backface culling i dont think for this? i can uncheck the box and it works ->that node output.

Now just look how happy he looks with a working outline