How is that different than before LLMs? You have no idea how the person came up with it, or whether they really understood.
We are inventing problems here. Fact is, an LLM writes better code than 95% of developers out there today. Yes, yes this is Lake Wobegone, everyone here is in the 1%. But for the world at large, I bet code quality goes up.
It's a lot harder for someone who has no clue what they're doing to write a lot of plausible-but-wrong code.