It is "nonsense" when your skills of comprehension are limited. If 1.46 was not a significant achievement the Dutch runner would be of no special interest. But he is faster than Rudisha was at the same age - and, as I said, he has recorded a faster time than Amos and Murphy achieved in the last Olympic final. That must put him the the ball-park of running at an international level. And at 17 he will only get faster.