The problem is that AI can generate answers and code that look relevant and as if they were written by someone very competent. Since AI can generate a huge amount of code in a short time, it's difficult for the human brain to analyze it all and determine whether it's useful or just BS.
And the worst case is when AI generates great code with a tiny, hard-to-discover catch that takes hours to spot and understand.
True, that is in some cases a problem. Though in this case it was pretty clear cut. At least the obvious time wasters would get the treatment.