[Nathan Zachary]

"It was too small," he wrote on the Bulletin of the Atomic Scientists, referring to the explosion.

Using what he called standard conversions, Park, a geologist, said North Korea appears to have produced a force of 4 kilotons or less through the test that took place in the northeastern region.

It all depends on how much fuel they used and what the target blast size was, all things this guy doesn't know.

Perhaps they made a bigger blast than planned, using only a small amount of fuel for testing a 3 KT miniaturized weapon and achieved greater efficiency than expected.

I doubt they are gong to supply the world with the data, so we can only speculate. I'd expect the worst.
Making old fat boy type nukes doesn't make much sense and is a big waste of their limited nuclear fuel. They're most likely trying to build modern miniaturized nukes for short the range missile capability they have.

[TigerLikesRooster]

Miniaturized nuke to be mounted on ICBM which can strike U.S. mainland is their ultimate goal. That is the way they can maximize their leverage against U.S.. Then against China, Russia, and Japan, too.