The Time Traveler laughed a final time. “All of your grandsons’ names were on lists. You wrote something . . . will soon write something . . . that will put your name, and all your descendents’ names, on their list. Including your only surviving grandson.”
This is another part of the essay about which I've been thinking. Is the author referring to this very "Message from a Time Traveler" as the piece which the author-in-the-story "will soon write"? In essence, saying, 'It's already too late'???
That's what I got out of it.