Doesn’t posting a link to the private key the servers are using ([0], under the Configuration heading on the linked page) compromise the privacy of everyone using the service?

[0] https://www.dns-oarc.net/files/tls-dns/pkey

From the FAQ:

  Q: What is OARC's Privacy Policy for use of its testbed
     nameservers?

  [...] If your DNS query data is sensitive, you should
  probably not be trusting it to an experimental 3rd-party
  research testbed.

Sure, but there is really no reason to publish the private key and make it trivial to decrypt all the traffic, right?