My interpretation of that posters argument is that someone who posts as much as this reddit user can’t be putting much effort into finding these links. That means there’s more lowest-common-denominator type content that people look at very quickly, upvote, and move on. That type of thing pushes out interesting discussion style posts, which is something that happens in every subreddit that gets large enough. Not sure what the solution is.
His point about “most” users disliking it is questionable, and might be misconstruing the thoughts of a vocal minority, but I think there’s some merit to an anti-hedonistic mindset when it comes to reddit style content posting.