Maybe we should take the definition from the mouth of an expert on fascism, Mussolini, "Fascism should more properly be called corporatism because it is the merger of state and corporate power."
This attribution leads to a truly fundamentally broken reduction of what Mussolini actually thought fascism was (though his own definition of it was largely pseudointellectual drivel).
But even then, "corporatism" doesn't mean "capitalism" at all.