The entire thrust this of the article seems to be that growth hacking should just be building a product people love and share. This in itself is completely obvious.
Even though growth hacking has become a silly term, all the points Andy Johns makes about reducing friction is exactly the philosophy that drives faster growth. The point of marketing or growth hacking or advertising or whatever you want to call the space is growing faster and acquiring more users with the product you have.
We can still stop using the term growth hacking though.