Most are comical enough to almost warrant being auto-flagged for unsubstantive, but some of them are spot on replies to examples of pedantry and an out of touch unsocialized audience within some really fascinating threads, I think this is a cool use of algolia
In my mind "Peak HN" or "Stereotypically HN" has always been this very distinct display of arrogant superiority while pedantically nitpicking some minor fault in OP's comment. Like, someone writes a five paragraph post, clearly an expert in some topic, and the first reply is "Ackshually, you are wrong: You said 'all' in paragraph 3, sentence 12, where you should have said 'some' because I can easily point out a counterexample. Therefore your entire five paragraph post is invalid!" I think it's a pattern all of us (or should I say most of us) have seen...
"Peak HN" is someone claiming your argument implies something you never actually meant, that can only follow through some arm-twisting of logic or reducto absurdum. Happens lot.
Oh, so you're saying only things you meant are what you said? Yeah right. Peak HN (This might be the most "meta" thing I've ever done - mockingly saying "Peak HN" while satirizing something mentioned in a comment defining Peak HN in response to a submission about an Algolia search of HN for the phrase "Peak HN." Oh wait, this parenthetical is one step further meta. ← And now that sentence. ← and now that sentence → Oh noooo)