You’ve said nothing that actually fits Stalin into any of the many definitions of fascism.
No reference to Eco, no mention of palingenetic ultranationalism, you could maybe use Gregor to fit your view even though other scholars discount his positions and ideas, but you don’t.
Even if you used the definition from a man killed as a result of Stalin, Trotsky, you still wouldn’t have a definition that found Stalin to be a fascist.
Dislike him if you want but use words that actually fit him and what he did. Fascist isn’t it.