Are Nordic model leftists supporters of Authoritarianism? That’s the key part.

Yes. Absolutely. By definition. By any leftist definition, the Nordic states are undeniably authoritarian. They are literally capitalist! The fact that you are even asking this is absurd.

Do they think a dictatorship is a good idea?

Yes, they think the dictatorship of capitalist class is a good idea. Again, this is undeniable by any leftist definition.

Or do they excuse or deny a genocide because the people doing it are opposed to the US?

Given that nobody does this, apparently there's no such thing as a tankie. Or are you just trying to slip in a blatant strawman?

Chompsky has done both

You listed three things, you illiterate dipshit.

Pol Pot

opposed to the US

You absolute fucking dumbass.