I think what bugs me (generally, not you so much specifically) is what I perceive to be so many ideas conflated into one. One can talk about a lot of different issues under the "imperial core" label, but I think one should be careful about considering who one talks about as imperial core according in context of the issue in question, since the imperial core is not a homogeneous group in a lot of matters, much like any other collection of countries. In particular, I think it is important to allow for some more varied terms of imperial core, else risking falling into a false dichotomy. I see that it might look pretty similar from a global south perspective, but I believe it is helpful to be more nuanced in the approach about who are imperial core to better analyze and understand the mechanics of the imperialism in play.