Pivot painter is used for animations of meshes with use of shaders. It can create animations from grass and trees to complex objects, but also object built and destruction as used in fortnite. Many other basic examples are shown in the content example project from epic that only stress the gpu.
If you find a bug, need a help or even create something with this addon, feel free to let me know.
With the addon come the examples shown in the video to help you understand the use of it.