Interpreting that claim as "SO users always, 100% of the time answer questions correctly" is uncharitable to the point of being unreasonable.

Most people would interpret the claim as concisely expressing that you get better accuracy from grumpy SO users than friendly LLMs.

For the record I was interpreting that as LLMs are useless (which may have been just as uncharitable), which I categorically deny. I would say they're about just as useful without wading through the mire that SO was.