Yeah, I've seen the two sites that claim that it's a fake quote. The link you posted contains a bunch of doublespeak in an attempt to avoid the fact that fascism leans very heavily into corporatism.
I didn't post a fake quote. I pasted a quote that two sites -- one of which is nearly a direct copy of the other -- claim is fake.
Do you disagree that fascism leans heavily into corporatism? Surely you realize that's the point here, right? If your entire argument is "I don't believe that Mussolini actually wrote that" then we have nothing to discuss.
Whether it's fake or not is missing the point. Either way, Italian fascism was corporatist. But "corporatism" doesn't mean what people think it means. It refers to dealing with society in terms of different fields, professions, and industries, with "corporation" referring to groups that represented the common interests of those. It's not used here in the common sense of "legally recognized business" and it doesn't refer to rule by said businesses.