Did slave owners actually eat slaves and black people during the Atlantic slave trade? There’s a tiktok that cites the Delectable Negro by Vincent Woodward talking about it. Did this actually happen?

The TLDR is no, but there's an asterisk on it.

Woodward used cannibalism in his book as a metaphor for a sexual or corporeal desire for the enslaved people, and especially the homoeroticism around the Black male body.

On page 18 of Woodward's book he says "the desire for the African slave or American black had epicurean implications. This desire was less about literal consumption and more about the cultivated tastes the white person developed for the African."

So that's what it's mostly about. But Woodward talks about stories among western African populations about the slave traders engaging in cannibalism. Woodward thinks most people have overlooked the possibility that these stories had truth at their basis but the consensus generally is that these stories are a common trope among cultures that don't understand each other, much like the European stories of African cannibalism, and are a reasonable kind of story to develop when one group of people are taking another group of people and disappearing them, never to return.

Woodward also looks at historic examples of the torture of enslaved people and the way it was often described as butchering or in similar terms to butchering.

Woodward also found examples where a slaver was described as cutting off a body part of an enslaved person and feeding it to other enslaved people. That was the only actual instance of cannibalism that I can find with a quick flip through of the book. (page 46)

There's a good review of his book, along with others on the topic and exploring similar themes at Early American Literature, Vol. 51, No. 1 (2016), pp. 157-177.

If you don't have JSTOR through your local library you can DM and I'll email you a pdf.