They are saying the exact opposite! The whole essay is about how financial markets are not some "mysterious unknown" and are instead predictable systems that are masked in a layer of bullshit that you can lean into and take advantage of. As a non-finance person, understanding "why" obviously terrible ideas get investment helps me understand how the world works. If we replaced the humans in the financial system with APIs, there would be inputs (pitch deck, founder persona, whatever) that can cleverly lead to an intended solution (raising capital, starting a company) in the same way that I could find a vulnerability on RuneScape or Eve Online, which I'm sure satisfies the traditional "hacker" definition. It's obviously not that cut-and-dry, but approaching the world in the "hacker mindset" is about observing and manipulating these systems.