This sounds like a positive outcome? A manager built a proof-of-concept of a feature that clearly laid out and fulfilled the basic requirements, and an engineer took 30 mins to rewrite it once it's been specified.

How long does it typically take to spec something out? I'd say more than 20 mins, and typical artifacts to define requirements are much lossier than actual code - even if that code is buggy and sloppy.

Not at all.

What was claimed was that a complete feature was built in record time with AI. What was actually built was a useless and buggy piece of junk that wasted reviewer time and was ultimately thrown out, and it took far longer than claimed.

There were no useful insights or speed up coming out of this code. I implemented the feature from scratch in 30 mins - because it was actually quite easy to do manually (<100 loc).