sort of. Having a system that allows multiple parties, like in many European countries, certainly helps with representation and discourse. But looking at Europe, it certainly doesn’t prevent a right-wing drift towards authoritarianism. There’s sooo many other things needed for a healthy democracy, like education/literacy, strong independent institutions, unions etc.

You can just end up with two right wing parties, an extreme and a moderate one, but the moderate one catering to the extreme positions of the extreme party (and being mostly moderate in name only), and both of them forming a majority government and drifting to authoritarianism, even if there are many parties.