Our detectives are back with the following intel on this WordPress site
The site is using the 10up 2016 theme by 10up .
We could identify 5 plugins (there might be more) - Batcache , Better WordPress Google XML Sitemaps (support Sitemap Index, Multi-site and Google News) , Google Analytics for WordPress by MonsterInsights , PushUp Notifications and Google Authenticator for WordPress
A WordPress XML Sitemap plugin that comes with support for Sitemap Index, Multi-site and Google News sitemap. Image sitemap is supported, too.