function force_https_stylesheet_dir_uri($url) {
    return str_replace('http://', 'https://', $url);
}
add_filter('stylesheet_directory_uri', 'force_https_stylesheet_dir_uri', 999);

function force_https_template_dir_uri($url) {
    return str_replace('http://', 'https://', $url);
}
add_filter('template_directory_uri', 'force_https_template_dir_uri', 9999);

function force_https_stylesheet_dir_uri($url) {
    return str_replace('http://', 'https://', $url);
}
add_filter('stylesheet_directory_uri', 'force_https_stylesheet_dir_uri', 9999);

function debug_template_dir_uri($url) {
    return 'DEBUG::' . $url;
}
add_filter('template_directory_uri', 'debug_template_dir_uri', 9999);
<br />
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	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	
	>
<channel>
	<title>
	Комментарии: Посттренинг	</title>
	<atom:link href="https://biznesrost.ru/blog/posttrening/feed/" rel="self" type="application/rss+xml" />
	<link>https://biznesrost.ru/blog/posttrening/</link>
	<description>Организация бизнес тренингов</description>
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</rss>