While true, the only anyone has to care that vibe coding* produces technical debt is that the LLM doesn't always properly clean up that technical debt without being prompted to do so, and that when you have too much technical debt your progress slows down regardless of if there's a human or an LLM doing the coding.

To put it another way, ask what code an LLM can maintain, not just what code a human (of whatever experience level) can maintain.

* in the original sense, no human feedback at any point