Just as a counter-example, one of my favorite HN comments of all time is from someone who remembered someone (kinda meta, right?) who called the Theranos fraud almost exactly years before it came out.
[1] https://news.ycombinator.com/item?id=29765308 (this is the thread remembering that comment)
[2] https://news.ycombinator.com/item?id=6349349 (this is the thread with the original comment)