Agreed - NK likes to saber rattle a lot. This is just more of the same.
One thing I have to begrudingly admit - they are really smart at approaching the edge of the line (to a nation ending war), without crossing it.
Also, it’s true that South Korea is not a nuclear armed State, but I can see why NK might sometimes feel like the opposite. South Korea hosts nukes from the US (for the defense of Korea) and is under the nuclear umbrella of the US (where the US promises to use nuclear weapons to defend South Korea if it’s attacked by a nuclear armed opponent).
More saliently, South Korea has successfully launched into outer space - this is the same rocket technology needed to launch an ICBM. So even if the US broke away, South Korea could go nuclear very quickly.
These are all part of NK’s calculation when it considers how far it’s willing to go in saber rattling.
A more accurate headline might be “Netanyahu mulls genocide” - except that the South Africa ICC case shows that genocide is already happening. So maybe “Netanyahu mulls extending genocide”