With a little code it can be deleted only on the blog pages you like. It is way more code then needed for a css hack, but the Kajabi app filters the style codes, so I create a small script, that isn't deleted by the app. Don't get overwhelmed by the code, just copy and paste.
Open the blog with the video, and click the <> from the blog html content.
Scroll down to the bottom of the blog html code and copy and paste this code at the end. That's all. It will hide the top blog image, after te page is loaded. So make sure your blog and your Youtube vid have the same image.

<p>
<script type="text/javascript">// <![CDATA[
function addStyle(styles) {
var css = document.createElement('style');
css.type = 'text/css'; css.appendChild(document.createTextNode(styles));
document.getElementsByTagName("head")[0].appendChild(css);
}
var styles = ' .blog-post-body__media {display: none;}';
window.onload = function() { addStyle(styles) };
// ]]></script>
</p>

 https://www.loom.com/share/9181ecbd828b4df3a3128b7b043e4fc5