Yes, he AI generated all of it, go through his articles at https://steipete.me/ to see how he does it, it’s definitely not “vibe coding”, he does make sure that what’s being output is solid.
He was one of the people in the top charts of using Claude Code a year back, which brought around the limits we know today.
He also hosts Claude Code anonymous meetups all over the world.
He’s overall a passionate developer that cares about the thing he’s building.