Yes, that was how North Korea's bomb was described this morning on the BBC World Service.
Paraphasing:

The Russians estimated that the bomb had a yield of between 5 and 15 Kilotons. By comparison, the first nuclear bomb that the U.S. dropped on Hiroshima had a yield of about 15 Kilotons. So this is a quite basic atomic device.

As I have recently finished Hiroshima by John Hershey, here's what that "quite basic" bomb did to a city of 237,000 people.

  • 100,000 dead
  • 62,000 of 90,000 buildings destroyed
  • Hibakusha "explosion-affected survivors" who suffered long term health effects all their lives from radiation poisoning

I'm always overwhelmed by the British capability for understatement.