I think understand where you're coming from - people can tell whatever they want, and the media definitely loves to run stories like this. These stories are both popular and the diplomatic risk is also low. And we also have the accounts of Yeonmi Park.

On the other hand, there's no reason to doubt the story too much. NyT's stories are generally highly factual, even though their primary bias is left-center. And we know that NK is a hellhole, not just from defectors, as the "Loyal Citizens of Pyongyang in Seoul" video states, but from a myriad of other, independent sources.

https://en.wikipedia.org/wiki/Yeonmi_Park#Veracity_of_claims