He's been fairly forthcoming about his process:
https://x.com/DannyLimanseta/status/2052040017007251946
Here are the direct links:
https://github.com/dannylimanseta/tinyskies
https://github.com/dannylimanseta/tinyskies/blob/cursor/glob...
https://github.com/dannylimanseta/tinyskies/blob/cursor/glob...