Grazie mille

Provo subito il tuo script

<?php
defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Router\Route;
use Joomla\CMS\HTML\HTMLHelper;
use Joomla\CMS\Language\Text;

$db = Factory::getDbo();

$query = $db->getQuery(true)
    ->select([
        $db->quoteName('a.id'),
        $db->quoteName('a.title'),
        $db->quoteName('a.catid'),
        $db->quoteName('a.created'),
        $db->quoteName('c.title', 'category_title'),
        $db->quoteName('a.language'),
        $db->quoteName('a.alias')
    ])
    ->from($db->quoteName('#__content', 'a'))
    ->join('LEFT', $db->quoteName('#__categories', 'c') . ' ON c.id = a.catid')
    ->where($db->quoteName('a.state') . ' = 0') // 0 è "non  pubblicato", puoi anche tirare fuori archiviati, ecc...
    ->order($db->quoteName('a.created') . ' DESC');

$db->setQuery($query);
$articles = $db->loadObjectList();

if (!empty($articles)) {
    echo '<ul style="list-style: none; padding-left: 0;">';
    foreach ($articles as $article) {
        $link = Route::_('index.php?option=com_content&view=article&id=' . $article->id . ':' . $article->alias . '&catid=' . $article->catid . '&lang=' . $article->language);

        echo '<li style="margin-bottom: 1em; border-bottom: 1px solid #ccc; padding-bottom: 0.5em;">';
        echo '<strong><a href="' . $link . '">' . htmlspecialchars($article->title) . '</a></strong><br>';
        echo 'Categoria: ' . htmlspecialchars($article->category_title) . '<br>';
        echo 'Creato il: ' . HTMLHelper::_('date', $article->created, Text::_('DATE_FORMAT_LC3'));
        echo '</li>';
    }
    echo '</ul>';
} else {
    echo '<p>Nessun articolo non pubblicato trovato.</p>';
}
?>