Does this mean the Galactic Empire and the Imperium of Man are also not empires?

Or even the Roman Empire itself.

> an empire is a state where the core ruling population exercises control and extracts resources from a periphery which is composed of people other than the core group

By definition, doesn't the later Roman Empire cease being an "empire" as there isn't really a "core" population anymore outside of some vague multi-ethnic military aristocracy.

Sure, Rome had a few lingering privileges and prestige, but little in the way of direct power. And certainly, the post-crisis Empire didn't exist to siphon resources on their behalf. Heck, pretty much as soon as the 3rd century crisis ended Italy itself lost most of its special status and more or less just became yet another province.

And once that was gone, they weren't really replaced by anyone except the imperial bureaucracy and aristocracy itself. So who are the "core" people here, because if "an aristocracy" is enough to count, then who the heck isn't an empire under this definition?

Maybe it's enough that they began as an empire under this definition. Or maybe Devereaux is fine with the stereotypical Empire losing its status as an empire long before losing its territory and power. Or perhaps would have some counterargument at hand if he happened to read this. Who knows.

The Galactic Empire as shown in the movies seems to have a very small core, almost all of the movies are set in its periphery rather than its central core. Tatooine is paying taxes to the Empire and subject to its troops, but doesn't seem at risk of being culturally seen as "Imperial". Alderaan wasn't subservient enough as a culture and is subject to genocide. Endor was certainly never truly imperial.

It's almost harder to define what the core of the Galactic Empire even is. We are told Coruscant is core to the Empire, but the glimpses of it in the Old Republic era certainly implied it was a very diverse place and we aren't really shown Coruscant in the films of the height of the Galactic Empire. To some extent the only truly "core worlds" and "core peoples" that we see in the films are the Star Destroyers and Deathstars, the military demanding taxes from every planet they pass.

The Empire may not be taking full advantage of the military power of a diverse people because of the over-reliance on clones and treating draftees as if they were clones when the clones start to run out, but beyond that it certainly seems to resonate like an Empire in the way this article describes an Empire to me.