Clear cache programatically

I found this code that is supposed to clear the cache, either fully, or per postID (page)

It doesn’t seem to be doing so for me.

// initilize WordPress environment
if (!defined('ABSPATH')) {
    require_once('./wp-load.php');
}

if (has_action('ce_clear_cache')) {
    do_action('ce_clear_cache');
}

if (has_action('ce_clear_post_cache')) {
    do_action('ce_clear_post_cache', 1111); // post_id
}

Found here

I can confirm that the action does exist, via has_action()