The US government didn't really say anything. A government funded non-profit that is supervised by an independent US agency said it. It has the same freedom of press as NPR would theoretically. Authorities in the EU is worried as well. Basically, without heroin, they think everyone will use fentanyl instead which is far worse. This is what occurred the last time there was a heroin shortage. So, ultimately, this will backfire greatly. And moreover, the ban was announced two years ago. When announced, it was believed it would actually be completed at a time that would have caused immense hardship on Afghans that were growing it, hence the claims the Taliban was turning a blind eye. Because they effectively were.
This is an extremely biased article against the US for some reason. There's a difference when drug production was essentially being done out in the open and then suddenly stopped. Satellites can easily find where the poppy fields were. You can't do this with marijuana, nor do I think you should. And on top of that, the drug problem the US has is importation or small scale manufacture. Its an entirely different problem. And again, the war on drugs was never meant to do what this article seems to imply.
I'm surprised at this article and it's conclusions. They're extremely deceptive, biased, and not entirely accurate.