A dictator is just someone with absolute power. How he got the power is orthogonal. He doesn’t have to gain power through insurrection or a revolution, he can gain it inside a democratic system. In fact in Ancient Rome, where the term comes from, the Dictator was appointed by congress in times of crisis.
Indeed, dictators are dictators, including all those in your examples. In the cases I brought up, an elected leader can turn into a dictator by not leaving when they lose an election, canceling regular elections, faking the vote totals, etc. One Person, One Vote, One Time.
