rctneil's questions

.statistics-section {
  border: 2px solid red;
}

.statistics-section:has(ul:has(:not(li))) {
  display: none;
}

<div class="statistics-section">
  <h2>Hello 1 - This should be visible</h2>
  <ul>
    <li>Item 1</li>
    <li>Item 2</li>
    <li>Item 3</li>
  </ul>
</div>

<div class="statistics-section">
  <h2>Hello 2 - This should be hidden</h2>
  <ul></ul>
</div>