Direct link to the video: https://www.youtube.com/watch?v=qzpZQe7JT-o

It's quite interesting, and describes how the developer used COBOL to implement a raycasting algorithm and generate a stream of PPM images to to pipe into FFplay. There's zero evidence of this being written in Claude; there are multiple clips of the developer working in VSCode, where the Claude plugin doesn't even appear to be installed.