OP is talking about how FDR was the first president to be elected for three terms, which is the same situation for Xi. Are you confusing the PRC and DPRK?
I wrote something on the DPRK’s elections a while ago [link]—the “hereditary” (of which positions are diffused, with the SAC being a modern development of decentralization) succession is a product of extreme hardship from being bombed to shit and starved and occupied by the U.S, and deciding upon candidates that are seen as “successors” to the pioneer of the country/visage who defeated the imperialists; whether or not this is correct in your eyes means nothing.