It's a real open source tool Yegge has built and been using for a while now. And no, it's not insane, he's literally written a book with Gene Kim about the fundamental lessons that go into it, and he's been on lots of podcasts where he explains more.

I expect major companies will soon be NIH-ing their own version of it. Even bleeding tokens as it does, the cost is less than an engineer, and produces working software much faster. The more it can be made to scale, the more incentive there is. A competitive business can't justify not using a system like this.

Where is the working software it produces? Do you have a repo you've made with it as an example?