No Gzip on live site

I’ve noticed one of my Treepl site’s content is not being served with gzip compression. www.greatsights.com.au
Do some of the lower Treepl hosting plans exclude gzip, is there a server config error, or do I need to activate something in the CMS?

All sites on all data centers should support gzip. Please submit a support ticket for this site and we’ll check what the issue is.