I tested your code and it seems to work fine, my guess is that your $targetHanldes containes the wrong handles.
Best option would be to see what $html and $handle contain and that way you could add them to the haystack.
But for now try this instead
$targetHanldes = array('flexible-shipping-notices', 'animate');
Again this is pure guess work so you better check the $html and $handle variables
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