I was just investigating this when I stumbled upon your post. It seems that the DNS server for the domain has issues. The maintainer of the site is (was?) Juli

I was just investigating this when I stumbled upon your post. It seems that the DNS server for the domain has issues. The maintainer of the site is (was?) Julian Mehnle, his personal website is also down. I've tried emailing him, but his email server seems also unreachable. Julian has a linkedin profile, but Linkedin won't let me send a message to Julian unless I pay them :(