If you can program the Big Bang, you can also program a few interstellar comets or asteroids to fly past Earth and be observed by mankind at precisely the point at which a certain personality writes his interstellar book. And why not have these interstellar comets or asteroids be the first to ever be discovered by mankind?
You could even send the biggest comet mankind had ever detected during this time period and have the announcement and confirmation of its discovery be made while this book was being written. And why stop there? Why not program the two astronomers who detect this comet to be comically named in a similar manner to this personality who is writing this interstellar book? And then name this comet after their names? I am of course talking about the Bernardinelli-Bernstein comet. Imagine if this interstellar book was being written by someone named Bernardo. Wouldn’t that be funny?