Vimeo froogaloop

Very much a newbie here, but I’m trying to use this idea to disable forward seeking in Vimeo clips embedded on a WordPress site

To my functions.php I’ve added

On a page with an embedded video, I’ve got

Where ‘video1’ matches the iframe label in the codepen example.

When I load the page source, I can’t even see frogaloop being listed, so I’m not sure the enqueuing is even happening…

Where am I going wrong with this ?