The thing is, it's possible to ask the LLM to add dynamic tracing, logging, metrics, a debug REPL, whatever you want to instrument your codebase with. You have to know to want that, and where it's appropriate to use. You still have to (with AI assistance) wire that all up so that it's visible, and you have to be able to interpret it.
If you didn't ask for traceability, if you didn't guide the actual creation and just glommed spaghetti on top of sauce until you got semi-functional results, that was $50k badly spent.
And if that had been done the $50k code base would be a $5,000,000 code base because the context would be 10 times as large and LLMs are quadratic.
If only we taught developers under 40 what x^2 meant instead of react.