The North Koreans have apparently confused their atomic (fission) bomb with a hydrogen (fusion) bomb.
Of course, all of us who took basic physics anytime since the 1950s know that fusion and fission are MONUMENTALLY different from one another. The differences are so obvious that even this morning’s McPaper (aka USA Today) had a cogent explanation that anyone can understand. Look it up.
Dark humor, certainly. Funny nonetheless.