Yes, this article is spinning the campaign of starvation the US imposed on the DPRK following the collapse of the Soviet Union and trying to pin it on economic mismanagement as if it were anything but the brutal sanctions preventing them from participating in global trade.

Here, Jimmy Carter agrees: https://www.reddit.com/r/northkorea/comments/1nki9kn/former_potus_admits_the_us_wanted_koreans_to/

Amnesty International is a (mostly) western organisation, staffed mostly by westerners. It receives funding from the British and American states as well as for American regime-aligbed foundations. It has been criticised many times for pro-western selection bias.

I would take what they say about the DPRK with a grain of salt.