Perhaps for extremely basic products. Most non-engineers can barely write and untangle their messy thoughts and you think they can just build a spec for an AI to build a product? Hopefully I'm wrong, but I doubt it.
Sure, there was some lead, but not nearly enough to 2x the team's productivity, let alone 10x.
Even when presented with something, there was still lead time turning that into something actually actionable as edge cases were sussed out.