Wouldn't it be callous (at best) of him to put information on Phoenix then? This was his colleague and the one man to saved Hydaelyn from certain destruction. Plus I doubt that everyone in Sharlayan would pass up the chance of summoning a Primal for research or power and that the Sons would be able to smuggle the books to Eorzea (where the author would be if your headcanon is true) so easily. Especially given the proximity to the House of Splendors.
