Anzeige Anzahl an Kundenbestellungen in WC Bestelldetails

//Anzeige Anzahl an Kundenbestellungen in WC Bestelldetails
add_action( 'woocommerce_admin_order_data_after_order_details', 'get_specific_customer_orders', 10, 1 );
function get_specific_customer_orders( $order ) {

    $customer_orders = get_posts( array(
        'numberposts' => -1,
        'meta_key'    => '_billing_email',
        'meta_value'  => $order->get_billing_email(),
        'post_type'   => 'shop_order',
        'post_status' => array('wc-completed'),
    ) );

    $orders_count = '<strong style="color:#ca4a1f">' . count($customer_orders) . '</strong>';

    echo'<br clear="all">
    <p>' . __( 'Anzahl an Bestellungen: ' ) . $orders_count . '</p>';
}