Part 1 is linked in this article and explains a bit: “Minions are Stripe’s homegrown coding agents. They’re fully unattended and built to one-shot tasks. Over a thousand pull requests merged each week at Stripe are completely minion-produced, and while they’re human-reviewed, they contain no human-written code.”

I could be wrong, but my educated guess is that, like many companies, they have many low hanging fruit tasks that would never make it into a sprint or even somewhat larger tasks that are straight forward to define and implement in isolation.