Currently the page is also showing a false negative in this case. My local DNS recursor validates DNSSEC:
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 1
But the test result says: Not protected from redirection to false IP addresses (DNSSEC)
For me it says now 'your DNS service providers are:' and then the name of the netblock owner. The actual name server is in my network.