I think the author is a bit behind the "complexity prompting" state of things. He says learning vibe coding is easy and he did it in a couple of weeks, but he also hit a wall and now its bugs everywhere. So maybe... there is more to learn?

I also hit the complexity wall and worked through it. LLMs are genius with arms that can reach anything but eyes two inches from the screen. As a metaphor, think of when a code base gets too big for one person to manage everything, people start to "own" different parts of the code. Treat LLMs the same and build a different context for each owner.

The key is to not get to a point where you lose sight of the big picture. You are riding a bronco - try not to get thrown off! If you do, ask the LLM to describe the structure of things or restructure things to be more consistent, etc. Get to a place where YOU understand everything, at least in an architectural sense. Only then can you properly instruct the AI forward.