There's not much information on which questions were picked or based on what criteria. Without knowing that, i think the numbers don't mean that much. I have started using chatGPT recently, and when it comes to coding at least I think it's quite easy to verify answers.
The reasons why I'll probably use chatGPT first before stackoverflow (which I've been using previously):
1. Instantaneous answers as mentioned in the article
2. Exact answers to my question. Often I find answers that come close but doesn't answer exactly. I rarely ask a question myself and would rather keep searching for an answer.
3. If there's something I don't get or something the answerer misunderstood, I can ask for clarification instantly.
4. I can ask about words i dont understand or common uses of a certain fucntion or example code for a hypothetical situation.
5. No need to feel embarrassed about my lack of knowledge cause chatGPT doesnt judge