Question What is this style of shader called?

What is this style of Shader called? (If it has a name)

In the Terrain Shader linked below, the edges of the painted textures have a sharp, cartoon edge.

https://video.twimg.com/tweet_video/D3KHHbJWAAA7dZB.mp4
(The video is from Twitter, the forum will not let me embed it)

Question 1) What is this style of Shader called? (If it has a name)
Question 2) How is this achieved in Shader Graph? (Spent all day since 9am yesterday trying to find a tutorial, it does not exist)

[Note]
I have been told the theory that gradients and lerps play a part, but I do not know how to implement these. So a practical example is what is needed.

 

Maybe you could next time take a screenshot and include it to your posts, so that we don't have to visit external links?

1: One could say the style looks "stylized", but that does not tell much. Some might call it flat-look or semi-flat.

2: You could use the lighting direction and make a custom shading gradient. Have a look at some of the toon shaders, the principle is the same. You find many by just using some google-fu, but here's two:
https://danielilett.com/2020-03-21-tut5-urp-cel-shading/
https://connect.unity.com/p/zelda-inspired-toon-shading-in-shadergraph

It's probably better to go through a few shader and Shader Graph tutorials so that you actually understand what you need to look for, when it comes to constructing the actual effect.