Most (all?) encryption functions are also hash functions, they're just special hash functions with the extra property of making it extremely difficult to discov

Most (all?) encryption functions are also hash functions, they're just special hash functions with the extra property of making it extremely difficult to discover the source. There's a fundamental difference between storing a password so that you can read it again (encrypt implies this), and storing it so that you can only verify it, not read it (hash). But a broader criticism of the article is that it is far too sweeping in its judgements based on scant knowledge of the topic - the little mistakes are just indications of that. It's fine to be a beginner asking questions and the mistakes are not really so important, but it's not really useful to attempt a definitive summary of a field which you know very little about.