Define DONOTCACHEPAGE does not work

I follow this guide here: https://wpmudev.com/forums/topic/hummingbird-definedonotcachepage-true-for-specific-page/#post-3715635 and I have the define(‘DONOTCACHEPAGE’, true); defined in a file: page-template-nocache.php in a childtheme (Mobilecursillo Divi Child); This template is in use for the page I do not want to cache. However, the page still contains the note that it is being cached by Hummingbird. I have
https://mobilecursillo.org/todays-readings.
Page template file:

<?php
define(‘DONOTCACHEPAGE’, true);
/*
Template Name: No Cache
*/
get_header();