The LLM got it to “working” state, but the people operating it didn’t understand what it was doing. They just prompt until it looks like it works and then ship it.
The parents are saying they'd rather vibe code themselves than trust an unproven engineering firm that does(n't) vibe code.
You could cut the statement short here, and it would still be a reasonable position to take these days.
LLMs are still complex, sharp tools - despite their simple appearance and proteststions of both biggest fans and haters alike, the dominating factor for effectiveness of an LLM tool on a problem is still whether or not you're holding it wrong.