You’re welcome!
Two issues I noted:
In content-author.php, the description says “The Template for displaying No Results.”
I imported the Templates directory to my theme, and when I ran Theme Check it said that there were was a problem with arrows in navigation-author.php. Somehow they got de-encoded and show up as ← instead of ←
And a request:
In content-author.php, <?php printf( __( '%s posts', 'simple-user-listing'), count_user_posts( $user->ID ) ); ?>
, it would be helpful to have a way to display the post count for a single post, so it doesn’t read “1 posts.”