Earlier quoted context omitted.
The example wasn't even finding a right answer so I don't see where you got that.. Searching questions/answers on SO can surface correct paths on situations where the LLMs will keep giving you variants of a few wrong solutions, kind of like the toxic duplicate closers.. Ironically, if SO pruned the history to remove all failures to match its community standards then it would have the same problem.
"But losing SO means that we're getting an idiot friendly guy with a lot of credible but wrong answers in place of a grumpy and possibly toxic guy which, however, actually answered our questions." > "actually answered our questions." Read carefully.
Read carefully and paraphrase to the generous side. The metaphor that follows that is obviously trying to give an example of what might be somehow lost.