Forward secrecy relies on asymmetric crypto, it merely uses short lived/one-time keys instead of long lived keys. The most popular algorithm for ephemeral key e

Forward secrecy relies on asymmetric crypto, it merely uses short lived/one-time keys instead of long lived keys. The most popular algorithm for ephemeral key exchange is (Elliptic curve) Diffie-Hellman which is just as weak against quantum attacks as RSA. So adding a post-quantum algorithm is just as important for PFS as for plain RSA.