That's mostly bullshit. NSA is just saying "don't start a multi-year project to upgrade from RSA to NIST P-256 because you will not be finished with that upgrade before we'll ask you to upgrade to a recommended PQ crypto scheme".
There is nothing wrong with X25519 and Ed25519, except that they are vulnerable to quantum computers (like anything else currently in use).
There is nothing wrong with X25519 and Ed25519, except that they are vulnerable to quantum computers (like anything else currently in use).