Did you miss that I explicitly stated "for several months" and not "forever"? It's enough to get you kickstarted and then you can begin varying (and also you will learn a lot about yourself during that time)
For example, I can eat more than half a kilo of kale in a day, over many days. This is like 20x the daily dose of vit K, 2.5x the daily dose of vit C, 1x the daily dose of vit A, etc. Then I'll rotate to kohlrabi for some time, then to cabbage, etc, etc.
Compared to my former pizza diet, this is insane. Indeed, thousands of times more micronutrients.