Hide the featured image of a specific category

Hi.

I want to hide the featured image of a specific category on a blog page in Genesis. I have used this code from Travis Smith, but it stopped working once my Eleven40 StudioPress theme was converted to HTML5:

add_action( 'genesis_before_post' , 'wps_no_featured_image' );
add_action( 'genesis_after_post_content' , 'wps_no_featured_image' );
/*
 * Remove featured image from certain posts.
 *
 * Stops featured image from displayed on the Small Group Show category (126) on
 * the blog page.
 *
 * @author Travis Smith
 * @link   https://wpsmith.net/2012/genesis/how-to-hide-the-featured-image-of-a-specific-category-on-the-blog-page-in-genesis/
 *
 * @global stdClass $post Post object.
 *
 * @return null Returns early if post is not in our chosen category.
 */
function wps_no_featured_image() {

    global $post;

    if (! in_category( array( 20,21,22 ) ) )
	return;

    if ( 'genesis_before_post' == current_filter() )
        remove_action( 'genesis_post_content', 'genesis_do_post_image' );
    elseif ( 'genesis_after_post_content' == current_filter() )
        add_action( 'genesis_before_post_content', 'genesis_do_post_image' );

}

You will note I’m trying to hide the featured images of categories 20,21 and 22: if (! in_category( array( 20,21,22 ) ) )

Yes, I did change the old XHTML loop hooks to the new HTML5 hooks:

add_action( 'genesis_before_entry' , 'wps_no_featured_image' );
add_action( 'genesis_entry_footer' , 'wps_no_featured_image' );

function wps_no_featured_image() {

    global $post;

    if (! in_category( array( 20,21,22 ) ) )
	return;

    if ( 'genesis_before_entry' == current_filter() )
        remove_action( 'genesis_entry_content', 'genesis_do_post_image' );
    elseif ( 'genesis_entry_footer' == current_filter() )
        add_action( 'genesis_before_entry_content', 'genesis_do_post_image' );

}

but it still does not work.

I’m front-end so this is completely baffling me.

I can’t find a plugin that does it (I’d rather not if I can help it).

I have tried the StudioPress forums.

Looking for a genius here…! Any help would be much appreciated.

??