True, in the sense that being healthy is also less stable than being dead.
Wrong, in any meaningful way, and obviously so: the linked index rates democracy on multiple dimensions, including protection of civil liberties, electoral process and pluralism, functioning of government, political participation, and political culture. It’s impossible to rate high on all those issues and not be “stable” in any meaningful sense.
FWIW Morocco is also quite stable, among the best both in Africa and the Arab world.