Remove H1 hyperlink from Blog Post page

I am trying to resolve the same issue identified in this thread https://kriesi.at/support/topic/remove-huperlink-from-blog-single-post-h1-titles/ however it doesn’t appear to be working for me, even after purging cache etc.

The H1 tag on this page https://dynamoselling.com.au/2020/06/30/zoom-for-success/ is linking to itself, which I am trying to remove.

I applied the following code to the functions.php page and it didn’t work;

add_filter(‘avf_title_args’, ‘fix_single_post_title’, 10, 2);
function fix_single_post_title($args,$id)
{
$args[‘link’] = false;
return $args;
}

Can you please assist me resolve this issue?

Thanks in advance