While NKorea’s nukes probably aren’t that powerful, the nukes possessed by Russia and the US are almost 10,000 times more powerful than the ones dropped on Japan during WWII. Hypothetically, if NKorea possessed a nuke of that power (highly doubtful), a direct hit on Hawaii would have some definite impacts on the West Coast, more specifically California and Mexico. Not direct blast radius, mind you, but serious nuclear fallout. It would not be pretty.
Granted this person doesn’t seem smart, but they do make a valid point.