The new subreddit is not for general haskell discussion, it's only for the discussion of things related to the haskell-lang.org site.

Source: https://www.reddit.com/r/haskell/comments/4ghznv/improved_hp...

Note that the community page on haskell-lang.org still links to /r/haskell: https://haskell-lang.org/community

I understand why this is confusing though, since the HN link goes to an annoucements page which mentions the new subreddit prominently), but the homepage for haskell-lang.org does not.