I'm surprised to see symmetric algorithms in this list. It's been a while since I worked adjacent to the field (I'm not a cryptographer but spent a lot of time working with them in a past life), but my understanding is that PQ refers to replacing those algorithms that are vulnerable to advances in quantum computing, e.g., public key algorithms, such as RSA, that use relative primes and are therefore subject to attack by efficient implementations of Shor's algorithm.

AIUI, symmetric algorithms such as 3DES are not subject to these attacks, but my understanding could be wrong.

Care to enlighten?