Lazy Load Embedded YouTube Videos (triggering with Elements by Post Tag)

Hey GP Team,

I'm trying to implement a YT embed tutorial found here:

https://webdesign.tutsplus.com/tutorials/how-to-lazy-load-embedded-youtube-videos--cms-26743

It should allow me to pull YT thumbs without loading the entire YT embed, helping the page load faster... unfortunately, I can't get it to work and I wanted to ask what I am doing anything wrong?

I have loaded both the CSS style and javascript onto a single wphead Element that is triggered by Post Tag. The player loads as expected but it doesn't pull any thumbnails and won't load the video either.

Here is the code I am loading via GP Elements:

<style>

.youtube {
    background-color: #000;
    margin-bottom: 30px;
    position: relative;
    padding-top: 56.25%;
    overflow: hidden;
    cursor: pointer;
}
.youtube img {
    width: 100%;
    top: -16.82%;
    left: 0;
    opacity: 0.7;
}
.youtube .play-button {
    width: 90px;
    height: 60px;
    background-color: #333;
    box-shadow: 0 0 30px rgba( 0,0,0,0.6 );
    z-index: 1;
    opacity: 0.8;
    border-radius: 6px;
}
.youtube .play-button:before {
    content: "";
    border-style: solid;
    border-width: 15px 0 15px 26.0px;
    border-color: transparent transparent transparent #fff;
}
.youtube img,
.youtube .play-button {
    cursor: pointer;
}
.youtube img,
.youtube iframe,
.youtube .play-button,
.youtube .play-button:before {
    position: absolute;
}
.youtube .play-button,
.youtube .play-button:before {
    top: 50%;
    left: 50%;
    transform: translate3d( -50%, -50%, 0 );
}
.youtube iframe {
    height: 100%;
    width: 100%;
    top: 0;
    left: 0;
}
</style>

<script> 
	
	( function() {

    var youtube = document.querySelectorAll( ".youtube" );
    
    for (var i = 0; i < youtube.length; i++) {
        
        var source = "https://img.youtube.com/vi/"+ youtube[i].dataset.embed +"/sddefault.jpg";
        
        var image = new Image();
                image.src = source;
                image.addEventListener( "load", function() {
                    youtube[ i ].appendChild( image );
                }( i ) );
        
                youtube[i].addEventListener( "click", function() {

                    var iframe = document.createElement( "iframe" );

                            iframe.setAttribute( "frameborder", "0" );
                            iframe.setAttribute( "allowfullscreen", "" );
                            iframe.setAttribute( "src", "https://www.youtube.com/embed/"+ this.dataset.embed +"?rel=0&showinfo=0&autoplay=1" );

                            this.innerHTML = "";
                            this.appendChild( iframe );
                } );    
    };
    
} )();

</script>

Then the actual HTML div gets embedded onto the page via Gutenberg HTML Block:

<div class="wrapper">
    <div class="youtube" data-embed="PASTEYOUTUBEVIDEOID">
        <div class="play-button"></div>
    </div>
</div>

The player gets loaded but then stops there... it doesn't seem to pull anything from YouTube. What am I doing wrong?

https://paste.pics/61a1446a41e76098a6bed430f07cc54c