I agree this was a bit of a puzzle for me too. Eventually, I realized that the blog post had appeared on my Damus home page, after creating an account via the iOS app, which, I assume, auto-subscribed me to it...

nokey

They provide absolutely no explanation how/where they look for comments, as in what distinguishes a comment under damus.io from any other nostr event.

nostr is super exciting. Can't wait for it to become so big that my device won't try to autocorrect it to nostril when I type its name...