Visualization author here. Cool to see it get some HN love despite being six years old.
Unfortunately, the visualization project is effectively dead. The Raft visualization involved a lot of painful D3.js coding and effectively writing a JS Raft implementation. In hindsight, a deterministic format would be much easier. I toyed around with learning After Effects in hopes of producing some other visualization videos but I never did finish any.
I'm glad folks are still getting value out of the Raft visualization. The paper is good but it helps to see data move over time to really make it click.