I assume that Time Dithering was probably slightly deformed in translation and actually stand for Temporal Dithering.
While researching for Kuwahara & Temporal Dithering, I stumble on the Artstation of Ansh Patel who shared a similar result to the one of IO chair. Unfortunately he doesn’t share step by step instruction but he still mention a few hints on how the effect was realized in his post called “Painted World (UE4): Real-Time Shading”
Implemented an impressionistic “paintbrush” shader with an anisotropic Kuwahara with temporally-dithering AA and directional blur. To add a bit of dynamism to the scene, I also implemented an additional HLSL shader applied through a CustomDepth pass to create a “painted motion blur”.
Both shaders are used as screen-space post processing effects written largely using HLSL
The key seems to be in combining HLSL code for Temporal Dithering with the Kuwahara. Unfortunately my knowledge with HLSL is too limited for me to figure it on my own. Maybe one of you will have more luck ! If so sharing the method will be greatly appreciated ! 