Custom Our Authors Extra Widget

class Custom_ET_Authors_Widget extends WP_Widget {

    function __construct() {
        parent::__construct(
            'dt_et_authors',
            esc_html__( 'Custom Extra - Authors', 'extra' ),
            array(
                'description' => esc_html__( 'Display a list of authors.', 'extra' ),
            )
        );
    }

    public function widget( $args, $instance ) {
        $query_args = array(
            'who'     => 'authors',
            'order'   => 'ASC',
            'orderby' => 'display_name',
        );

        $authors = get_users( $query_args );

        echo $args['before_widget'];
        if ( ! empty( $instance['title'] ) ) {
            echo $args['before_title'] . apply_filters( 'widget_title', $instance['title'] ). $args['after_title'];
        }
        ?>
        <div class="widget_content">
            <ul class="widget_list">
                <?php
                foreach ( $authors as $author ) {
                    $is_author = $author->divi_capabilities['administrator'];
                    $count = count_user_posts( $author->ID );
                    $count = sprintf( _n( '%d Post', '%d Posts', $count ), $count );
                    $url = get_author_posts_url( $author->ID );
                ?>
                <?php if (!$is_author) {?>
                    <li>
                        <a href="<?php echo esc_url( $url ); ?>" class="widget_list_portrait" rel="author">
                            <?php echo get_avatar( $author->ID, 150, 'mystery', esc_attr( $author->display_name ) ); ?>
                        </a>
                        <a href="<?php echo esc_url( $url ); ?>" class="widget_list_author">
                            <h3 class="title"><?php echo esc_html( $author->display_name ); ?></h3>
                            <span class="post-meta"><?php echo esc_html( $count ); ?></span>
                        </a>
                    </li>
                <?php } ?>
                <?php } ?>
            </ul>
        </div>
        <?php
        echo $args['after_widget'];
    }

    public function form( $instance ) {
        $title = isset( $instance[ 'title' ] ) ? $instance[ 'title' ] : esc_html__( 'Our Authors', 'extra' );
        ?>
        <p>
            <label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php esc_html_e( 'Title:', 'extra' ); ?></label>
            <input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" />
        </p>
        <?php
    }

    public function update( $new_instance, $old_instance ) {
        $instance = array();
        $instance['title'] = ( ! empty( $new_instance['title'] ) ) ? sanitize_text_field( $new_instance['title'] ) : '';

        return $instance;
    }

}
function dt_load_widget() {
    register_widget( 'Custom_ET_Authors_Widget' );
}
add_action( 'widgets_init', 'dt_load_widget' );