Ah wow, when did this occur? It seem implausible that a nation would refuse to treat a patient unless hospitals were at some sort of max capacity, how many people died in this manner? What is the inflection age where the death trend for that age group spikes? I would expect it to be visible and measurable. Did any other countries practice such a program?
Also you said it was an official declaration, what date did this announcement occur? It might help to reduce the questions I ask if I can look it up and link it.