[kniht]

That proposal is for an ephemeral, per gTLD client key and an example of mutual authentication that aims to defeat _active_ attackers (MITM).

Perfect forward secrecy in TLS is a bit different in that the ephemeral diffie-hellman key exchange sets up a shared key that is protected from a _passive_ attacker that observes the TLS encrypted communication and later gets a copy of the server's public key.