Of course they’ll talk about the British Empire. The British Empire is one of the favorite punching bags of these people. The evil white imperialists who invented all that is wicked on the planet.
They probably won’t make the point that slavery is as old as history records.
They probably also won’t mention the Royal Navy’s West Africa Squadron founded at great expense in 1808 to help suppress the Atlantic slave trade.
And as for that man, Wilberforce, probably far too pale (and therefore evil) to be mentioned.