No, in the general case you're not responsible for making sure your users make the right decisions. Imagine doing that for a dating app. Should you date this person? How should I know? All I can do is present you with information.
The article, though, is about software that specifically exists to help businesses make better decisions. So yeah, if you're writing software that's supposed to help people make better decisions, you do have some ethical duty to write software that leads people to make better decisions. If you're writing such software that DOESN'T do so, why?
This is just a specific instance of the general idea that if you write software to do a thing, it should actually do that thing.