As a regular, I disagree completely. Comments that point out that something is wrong and have the empathy to try to help and identify a solution are much more upvoted that cynical ones that just point out that something is wrong without much caring for the other part.
If you dig up HN only paying attention to potentially toxic comments, you will find them. It doesn't make HN toxic. If you create the habit of reading yesterday's posts, giving them enough time for the best comments to be upvoted and settle at the top, you will see much much less toxicity.
It seems to me that the author is trying to get away from a certain behavior and, in the process, everywhere they look they just fit what they see in that exact behavior. Like when Woody Woodpecker is hungry.