I appreciate that you're asking in good faith, so I'll answer in good faith the problem was never that the story acknowledged slavery. It's that it made slavery the backdrop for a narrative centered on the humanity and morality of someone from the slave-owning family. Whether he frees the enslaved people or not doesn't erase that framing it reinforces it by making his "goodness" the emotional focus that's why "would you rather he stayed a slave owner?" isn't really the question. No, I'd rather the story not use the suffering of enslaved people primarily to establish the protagonist as noble as for the "I'm your slave" line, yes, context matters. In a story explicitly set around slavery, using that language carries different weight than it would in a modern fantasy or consensual BDSM context. People aren't criticizing the phrase in isolation; they're criticizing it within the story's historical framing regarding the author's apology, I don't think anyone should harass or insult her personally. Criticizing the work is fair. Harassing the creator isn't. She herself decided she wasn't confident she could portray the subject with the care it deserved, and that's her decision.
Ohh now I get ittt thank you so much for explaining I am dumb...
....may I am too dumb to understand what is happening It just looks li3k a normal bl to me but after reading teh comments I am understanding maybe it's not can someone explain why clearly though I am slow I am sorry