A KDF is not reversible so it's not encryption (a bad one can be brute forced or have a collision, but that's different from decrypting it even if the outcome is effectively the same). As long as you're salting (and ideally peppering) your passwords and the iteration count is sufficiently high, any sufficiently long password will be effectively unrecoverable via any known means (barring a flaw being found in the KDF).

The defining characteristic that separates hashing from encryption is that for hashing there is no inverse function that can take the output and one or more extra parameters (secrets, salts, etc.) and produce the original input, unlike with encryption.