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Please Try This To Get Post in DESC order

$args = array(
    'orderby' => 'title',
    'order'   => 'DESC',
    'author' =>'authorName',
);
$query = new WP_Query( $args );

// The Loop
if ( $query ->have_posts() ) {
    echo '<ul>';
    while ( $query ->have_posts() ) {
        $query ->the_post();
        echo '<li>' . get_the_title() . '</li>';
    }
    echo '</ul>';
} else {
    // no posts found
}
/* Restore original Post Data */
wp_reset_postdata();

Please Check This Link

I hope this will help you.
have a good day 🙂