Can't find a presentation I watched

I remember watching a great presentation explaining how Nix works from scratch without going into all the specifics. It was about a theorethical guy that creates a company named GrayCat and almost drowns in the complexity and unreproducibility of traditional CI pipelines and package management.

I was going to link it to a friend but I can’t find it anywhere. Could someone help?

“Own your CI with Nix” by @thufschmitt