Ask HN: GPT-3 as an attentive-reading test for humans?

Would you agree that GPT-3 articles hidden among a few human written articles could be a useful way to test reading/cognition abilities of humans?

Looking at this post; https://liamp.substack.com/p/my-gpt-3-blog-got-26-thousand-visitors

Then comments under the highest ranked GPT-3 generated post; https://news.ycombinator.com/item?id=23893817

Only 2 people noticed it may be written by GPT-3. Are attentive-readers so rare?