Be wary of what you read in the press. Few journalists have access to North Korea, and the sources of “information” are enemies of the regime. While that doesn’t prove the falsehood of the statements, it suggests being dubious.
Enemies of people, especially when engaged in a life or death armed struggle, do tend to be less than objective in reporting (and making up) facts.
Given that in a war the government will depend on the loyalty of the conscript army, I doubt they’ll try to antagonize them by eating their relatives.