hide author box on specific users

add_filter( 'jnews_single_show_author_box', 'hide_on_spesific_user', 99, 2 );


function hide_on_spesific_user( $flag, $post_id ) {
    $hide_user_list = array( 29, 40, 1 );  /* the list of user_id thtat you want to hide the author box */
    $author_id      = get_post_field( 'post_author', $post_id );
    $flag           = in_array( $author_id, $hide_user_list ) ? false : true;

    return $flag;
}