It seems like you're using a different definition of "better" than the article author or most of the people responding to your comment. You seem to treat things as a binary – as though the headline is only justified if it can take a non-writer and turn them into a writer. And in that light, your criticism makes sense: reading an article isn't going to do the job without passion and a certain latent capability.
But I'd suggest that others mean "better" in the relative sense of "greater than" or "more" and mean it to refer to skill or dexterity of a sort. If someone has a certain degree of skill or dexterity – the degree that makes them a member of the article's target audience – then, the author is claiming, they can increase their skill by engaging with the recommended material. And I'm curious whether you disagree with that position.
If you agree with it, this might just be a case where people are talking past each other based on different definitions, despite agreeing about the substance of the article.
But I'd suggest that others mean "better" in the relative sense of "greater than" or "more" and mean it to refer to skill or dexterity of a sort. If someone has a certain degree of skill or dexterity – the degree that makes them a member of the article's target audience – then, the author is claiming, they can increase their skill by engaging with the recommended material. And I'm curious whether you disagree with that position.
If you agree with it, this might just be a case where people are talking past each other based on different definitions, despite agreeing about the substance of the article.