Its false be he earned what he had . he was a very good president .
But in modern times, as we see, Wakanda is a thriving, flourishing civilization with few conflicts with the outside world. So the primary function of challenge day is keeping the peace internally, with making sure the Black Panther is a fit protector now a secondary outcome. And there for it was kept a hidden for a while.
Answer:
He faced recurrences of the disease in 1999 and 2006.
Someone tried to improvize tools