He is/was despicable as the leader of mercenaries ready to sell their services to any authoritarian regime, but I don't see clear relationship with Nazism, do you have sources? It seems weird to me that a Nazi would accept to work for African juntas for example.

Both can be true at the same time, with the caveat that actual Nazis aren't called Nazis in Russia but nationalists, patriots, suchlike.

But in the end Prigozhin might not have been a Nazi -- in the ideological sense -- but simply a crook. You don't really need a racist or such ideology to build a colonial empire in Africa, plain ole criminal mindset suffices.