I use AI for my work every single day - and during some weekends too. Claude Code, with Opus. It is far from being able to reliably produce the code that we need for production. It produces code that looks ok most of the time, but I have seen it lose track of key details, misinterpret requisites and even ignore them sometimes - "on purpose", as in it writing something like "let's not do that requirement, it's not necessary".

This kind of thing happens at least once per day to me, maybe more.

I am not denying that it is useful, let me be clear. It is extremely convenient, especially for mechanical tasks. It has other advantages like quick exploration of other people's code, for example. If my employer didn't provide a corporate account for me, I would pay one from my own pocket.

That said, I agree with OP and the author that it is not reliable when producing code from specs. It does things right, I would say often. That might be good enough for some fields/people. It's good enough for me, too. I however review every line it produces, because I've seen it miss, often, as well.