None of his ideas have anything to do with fascism. Rallying against leftism does not make one a fascist. As far as I remember, in Industrial Society and its Future, Kaczynski did not propose authoritarianism or nationalism in any way or form.
it would be nice if that word wasn't overused to the point of becoming essentially meaningless in contemporary discourse—it seems like a word that should probably retain a significant amount of gravitas!