Many comments complain how Troy explains about technical stuff like encryption vs. hashing and the users don't care about or understand it. However, don't forget that many readers of his blog are the technologically literate and can appreciate the nuances of this content. In fact, I find this particular post quite easy to understand for any beginners who want to learn about about password security.
The distinction between encryption and hashing can never get too much education, both for the end users and the more technical developers/sysadmins.
If we're being extra pedantic, hashing is just using some function that maps inputs to a set of values and is not necessarily hard to reverse and he should've used the term cryptographic hash.
But you're talking about cryptographic hashes which are by design difficult/impossible to reverse. Their unidirectional nature is what makes them cryptographic hashes instead of just plain hashes.
The distinction between encryption and hashing can never get too much education, both for the end users and the more technical developers/sysadmins.