Well this is going to be a trick..
I tried all of the auto demosaics from Marco first, but no luck.
The assembly files have been hidden somehow. If you look at "ScriptingAssemblies.json" you can see that the assembly files are being referenced, but there's no path.
There are files being packaged through a special compression / encryption using a ".abc" and ".dat" format.
Haven't figured out how to unpack those, and I think that's where the assemblies are hiding.
And so far the workaround for hex editing hasn't been fruitful, because UAS isn't finding any shaders.
I'll follow up if I can figure something out.
The only thing I can find related to a mosaic is a mesh file titled as mosaic, which is literally the mesh for the vagina.