Analysts Believe that North Korea is Falsely Claiming they Launched a New ICBM
It appears that since the North Koreans failed in the launch of their new ICBM they decided to fire off their older ICBM and claim it was the new one:

 South Korea and the United States regard North Korea as having disguised its launch of an existing intercontinental ballistic missile (ICBM) last week as that of a new larger one, informed sources said Sunday.
The allies believe that the North again tested a Hwasong-15 ICBM on Thursday, the same type it fired in late 2017, according to the sources. The North has publicly claimed success in the launch of a Hwasong-17 missile.
Their intelligence analysis suggested that like the Hwasong-15, the ICBM in question had two engine nozzles, whereas the Hwasong-17 has four nozzles. The engine combustion time of the first-stage rocket was also similar to that of the Hwasong-15.
Yonhap
You can read more at the link.


Communists lie? Who ever heard of such a thing?
But but but, the Japanese government claims North Korea’s rockets can reach 15,000 KM. Are you sure about this? Didn’t you claim the Japanese were superhuman class intelligence?
Their intelligence analysis suggested that like the Hwasong-15, the ICBM in question had two engine nozzles, whereas the Hwasong-17 has four nozzles. The engine combustion time of the first-stage rocket was also similar to that of the Hwasong-15.
Don’t know why they are saying that the missile in question had two nozzles when according to the photo below, four nozzles can be seen.
OK. so Kim may have edited and sassed up the video.
But at the end of the day, we will never know for sure, unless the CIA or the NIS had agents among the missile crew on the day of the test.