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The source code is posted on the author's github, by the way:

He has some files named after GPT3 and GPT4. I wonder what that's about

looks like they were playing around with getting gpt to write some code to render the particles

Particles.js

Particles2d.js

ParticlesGPT3.js

ParticlesGPT4-meh.js

ParticlesGPT4.js