Diluted urine makes excellent fertilizer, but too much will kill everything. Must be a build up of something that gets too high in concentration for the plants to handle after a while. I imagine peeing from height dispersed the urine enough in this case that wasn't an issue.

I do find the post mildly interesting, it has an interesting application for survival scenarios if you find yourself having to grow your own food without commercial fertilizer.

Feces is of course an ancient fertilizer too, but the problem with using human shit (looking at N. Korea here) is that it becomes a vector for the transmission of parasites.