I was interested in this as well. The site is awesome and beautiful. And, I wished the SVGs were built in a way that (from my limited interaction) is basically just swapping new SVG in for each tick. It's really pretty, but I wished there was a bit more interaction and composability.

Seems a bunch of excalidraw outputs stacked together, no?

May be. I don't know. Thanks for answering - will check the excalidraw!