After all there is a lot of commercial surveillance software that sold to authoritarian regimes. Of course that doesn't mean someone work directly with NK.
edit: Even simple surveillance features like file tagging are already deployed within the US, and is how the FBI claims to track stolen documents to Chinese hackers. Although, the system the FBI uses to track document content traversing the internet is likely quite a bit more sophisticated. The prototype system can even be a rootkit spying system used by corporations to spy on their employees and/or their consumers and customers.
The chain of sales is almost certainly from Silicon Valley, to a Chinese front, to North Korea or [ SV and China ] to North Korea. SV, US, and China work closely together in regards to surveillance, the only real difference is their rhetoric and how they sell it to their citizens.
It's not the problem of whether North Korea is implementing these features, as North Korea did not create anything original but rather see's these features already being provided. The problem that Silicon Valley and the US has is that companies (err... countries) like North Korea are implementing (or have implemented) it before their own companies have and that diminishes their capacity to claim IP to related implementations.
* targeted: meaning they can target individuals, and various sizes of groups based on sophisticated and targeted profiling. Trump's campaign used this to divide and conquer the 2016 election.