【WordPress】Ajax＋非公開カスタム投稿で問い合わせ履歴をユーザーにだけ表示する方法

function register_inquiry_post_type() {
  register_post_type('inquiry', array(
    'label' => '問い合わせ履歴',
    'public' => false,
    'show_ui' => true,
    'supports' => array('title', 'editor', 'author'),
    'capability_type' => 'post',
  ));
}
add_action('init', 'register_inquiry_post_type');

// 問い合わせフォーム送信時の投稿作成例
function create_inquiry_post($title, $content) {
  if (!is_user_logged_in()) {
    return false;
  }

  return wp_insert_post(array(
    'post_type'   => 'inquiry',
    'post_title'  => sanitize_text_field($title),
    'post_content'=> sanitize_textarea_field($content),
    'post_status' => 'private', // 必ずprivateにする
    'post_author' => get_current_user_id(), // 送信者本人を投稿者にする
  ));
}

function enqueue_user_inquiries_script() {
  wp_enqueue_script('user-inquiries', get_stylesheet_directory_uri() . '/js/user-inquiries.js', array('jquery'), null, true);
  wp_localize_script('user-inquiries', 'ajax_object', array(
    'ajax_url' => admin_url('admin-ajax.php'),
    'nonce'    => wp_create_nonce('user_inquiries_nonce'),
  ));
}
add_action('wp_enqueue_scripts', 'enqueue_user_inquiries_script');

jQuery(document).ready(function($) {
  $.ajax({
    url: ajax_object.ajax_url,
    type: 'POST',
    data: {
      action: 'load_user_inquiries',
      nonce: ajax_object.nonce
    },
    success: function(response) {
      if (response.success) {
        $('#user-inquiry-list').html(response.data);
      }
    }
  });
});

function ajax_load_user_inquiries() {
  check_ajax_referer('user_inquiries_nonce', 'nonce');

  if (!is_user_logged_in()) {
    wp_send_json_error('ログインが必要です');
  }

  $current_user_id = get_current_user_id();

  $args = array(
    'post_type' => 'inquiry',
    'post_status' => 'private',
    'author' => $current_user_id,
    'posts_per_page' => -1
  );
  $query = new WP_Query($args);

  if ($query->have_posts()) {
    ob_start();
    echo '<ul>';
    while ($query->have_posts()) {
      $query->the_post();
      echo '<li><strong>' . esc_html(get_the_title()) . '</strong>：' . esc_html(wp_trim_words(get_the_content(), 20)) . '</li>';
    }
    echo '</ul>';
    wp_reset_postdata();
    $html = ob_get_clean();
    wp_send_json_success($html);
  } else {
    wp_send_json_success('<p>履歴はありません。</p>');
  }
}
add_action('wp_ajax_load_user_inquiries', 'ajax_load_user_inquiries');

<div id="user-inquiry-list">読み込み中...</div>