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Author of the article here.

Nope, the article doesn't conflate DRY and small functions. But the quest for DRY can lead to an explosion of small functions, which isn't necessarily a good thing.

The vice versa is true as well - many programmers, in their quest to make functions as small as possible, end up DRYing it up to the fullest extent as well.

There's a relationship between the two, but DRY and small functions aren't synonymous themselves, and neither does the article suggest that anywhere.