I doubt he'd have much luck elsewhere. By his own graphic he had no objection to 50% of the articles and honestly that's a pretty good return rate all-in-all. No community is ever going to exactly reflect any one person's likes and dislikes. Especially a community as large as HN.

Any site that can produce 15+ interesting articles a day in exchange for the roughly minute and a half it takes to skim the HN headlines is doing great in my book.