are session key generated during RSA key exchange mode ephemeral

A cryptographic key is called ephemeral if it is generated for each execution of a key establishment process.

We don’t we say then that the pre-master secret used in RSA key exchange mode during an TLS handshake and the derived session key from it are ephemeral ? Of course it does not provide Forward Secrecy as it is using the same public key from servers certificate over and over again, but still the session key is generated on each session. What am I missing ?