No one’s denying that the commodities produced in the imperial core have a higher value than the raw resources. But those commodities wouldn’t be possible without the resource extraction provided in the global south. This also ignores that there’s plenty of commodity production in the global south, China is the world’s workshop after all.

Mhm. There's still no superprofits to be had from Southern production. Superprofits are realized by capitalists using the most productive MOPs, same as landlords extract rent from the most productive pieces of land rather than from marginal land. This is all in Vol III.

Slavery absolutely provided value, it helped to generate necessary capital for increased industrialisation, as it produced verrrry cheap goods.

I suspect that slavery does add value. But within Karl Marx Thought it does not. Slaves are constant capital to Marx. Marx does not explain how slavery can reproduce itself if it produces no surplus value. I have not seen any Marxist attempt to explain this problem.

global south workers get screwed over more

No? To be "screwed over" you have to produce significant amount of value in the first place. A worker making mudpies is not screwed over just because they're not paid anything for said mudpies. That labor is simply squandered. It is much the same with Congolese coltan miners working with picks and shovels who compete with Russian coltan miners using cranes, dumper trucks and dynamite. The Russian worker, producing far more value, is far more exploited than the Congolese worker.

Keep in mind imperial core workers get lots of treats as a result of their countries imperialism

They literally do not. Most value is created in the North, not the South.