My first thought was he was being sarcastic.
It’s feint praise that is typical in his dealings with people. The praise means nothing to him, but it helps oil the communication lines.
yes i read it as a trap- laden w/sarcasm. knowing how DJT feels about WHO, it seemed pretty clear to me that it was a jab at NoKo and WHO—like they deserved each other, a perfect match-up. since it didn’t get a lot of play, i think many weren’t sure how he meant it.