Râu Cao ⚡ on Nostr: It means to fetch and render events created/signed by a specific key. In this case, ...

It means to fetch and render events created/signed by a specific key. In this case, all article events. The author has no control over who fetches and syncs their stuff. I sync your articles to our relay for example, then subscribe from there (currently via RSS, because I haven't tried out Narr yet). There are also caching relays, mobile relays, etc.. This is why tying anything to a particular relay seems like the wrong approach to me.

Also, relays are identified via DNS and don't additionally sign content, so without any kind of tag mentioning the publication (in that case the relay), the author's intention for being published there is not clear.