So, North Korea is involved in hits not unlike some Russians do. But at the same time it may provide a cover for other state actors. May be unlikely in this case (I think the pattern here is making it indeed most likely that North Korea is responsible, it just fits so much; for similar reasons, it was very clear that Marsalek worked for the FSB and stole a lot of money from europeans https://en.wikipedia.org/wiki/Jan_Marsalek), but it should be kept in mind.