The author complains he couldn't add a Reddit RSS feed. I once looked into this. It was already a few years ago, but I guess it hasn't changed. The problem is that updating all Reddit feeds of all Feedly users goes way above Reddit's API call rate limits. So, it's probably simply not possible in a centralized free service. The problem isn't so much Feedly, but the various sites' (not only Reddit) ignorance or hostility towards RSS that results in these kinds of implementations.
Strange; I can subscribe to user rss feeds in Newsblur.
I'm guessing Newsblur somehow rotates through all the users' collective RSS feeds in some manner to not trip the rate limit, which might explain why new posts don't show up immediately.
(Which is fine for me as a user; most of the reddit RSS feeds I subscribe to, I don't need to see immediately!)