Thanks for the link. The source doesn't really pass the sniff test, though. Take, for example, the claim that North Koreans are permitted to leave the country.
From the Article 63 of this 2015 criminal law document:
A citizen who has committed an act of treason against the state, such as by betraying the State and
escaping to another country or surrendering, defecting or giving over secrets, shall be sentenced to a
term of reform through labour of more than 5 years. In particularly grave cases, he or she shall be
sentenced to life-term of reform through labour or to the death penalty and confiscation of
property.
This doesn't sound like a law only applied to violent criminals.