It doesn’t.

Sadly, the author hasn’t even realised their own flawed assumption, despite contributing plenty of words sledging those of others. The hint, from the text, is how you can practically hear the agitated airquotes around propagate.

What's more, the DNS does conventionally distribute zone updates via notification from master to replica. Despite its relevancy this mechanism is not discussed; in fact the word zone does not appear at all in this article, which is hoist with its own petard in presenting a half-baked model of the DNS.