I don't think there is anything for us to do here.  The authoritative server is breaking too many DNS 
fundamentals to interoperate.  If it set tc=1 it might be worth hacking around the broken EDNS 
support but to fix this we would also have to figure out tc=1 should have been set or force TCP for 
these servers.  Add to that there is a updated version of the server available I think the best solution 
is to accept the odd report like this and encourage the authoritative server to upgrade.

Note they have introduced a CNAME since the report was first published.