Our detectives are back with the following intel on this WordPress site
The site is using the Liquorice theme by Nudge Design .
We could identify 2 plugins (there might be more) - Better WordPress Google XML Sitemaps (support Sitemap Index, Multi-site and Google News) and Contact Form 7
A WordPress XML Sitemap plugin that comes with support for Sitemap Index, Multi-site and Google News sitemap. Image sitemap is supported, too.