Poland is not in the imperial core, it very much would like to be an imperialist power, but it isnt, the degree of exploitation is not as high as in the 3rd world, but its still exploited by the imperialist powers, for example germany uses poland for cheap labour
I agree that poland is a loyal dog of the imperialists, but it isnt an imperialist power itself, it didnt make the decisions to invade Iraq and Afghanistan and never benefited from it, it merely aided in these invasions to demonstrate it's servility