> It’s not until I opened up the full codebase and read its latest state cover to cover that I began to see what we theorized and hoped was only a diminishing artifact of earlier models: slop.

This is true vibe coding, they exclusively interacted with the project through the LLM, and only looked at its proposed diffs in a vacuum.

If they had been monitoring the code in aggregate the entire time they likely would have seen this duplicative property immediately.