I'm not sure its even that, his description of his role in this is:
"You are a Product Manager, and Gas Town is an Idea Compiler. You just make up features, design them, file the implementation plans, and then sling the work around to your polecats and crew. Opus 4.5 can handle any reasonably sized task, so your job is to make tasks for it. That’s it."
And he says he isn't reviewing the code, he lets agents review each others code from look of it. I am interested to see the specs/feature definitions he's giving them, that seems to be one interesting part of his flow.