Yes, that is the third option. Probably the simplest. Didn’t occur to me. Already using robots.txt. I could probably even redirect it. Would this be the correct parameter /wp-content/themes/preference/author.php? Am not sure if am suppose to block specific .php and if this one is the php.
But if I wanted to destroy all references to above URL so the page doesn’t exist, I would presumably need to delete some lines from which .php file?