It's implicitly understood by everyone who cares about this topic that salting is intrinsic to KDFs. I.E. by the time you've read through, and understood http://codahale.com/how-to-safely-store-a-password/, you understand why "salting" your password gains you nothing, because rainbow tables are no longer particularly relevant to cracking passwords. And yes, while there is salting inherent to KDFs, that's not the major feature of them, but an assumed implementation detail.