I commented on the vid, but will repost here too.

16:00 - 17:20

There is a fundamental difference other than moving the starting point.

In the copy/paste from StackOverflow case, the answers provided are considered in response to the question, and have been ranked by people indicating suitability.

In the generator case, the generators have been carefully considered and as mentioned for Auth, have been vetted by security professionals.

For generative AI, there is absolutely no consideration. It is simply producing something that is likely to follow the prompt, based on its model. This is why, for example, Cloudflare was able to release an OAuth library that made the fundamental error of not validating the redirect_uri. You may be getting something that is fundamentally wrong, because the machine has no understanding of what it’s doing.